adding new unit of measure for amount of substance: "particle"

[crystal-growth]

This PR adds new units of measure for amount of substance: "particle" as proposed in #317. New definitions and tests added for amount_of_substance, molar_energy, molar_heat_capacity, molar_concentration, catalytic_activity, and catalytic_activity_concentration. Tests for molar_energy were amended to be generic over the amount of substance units.

[iliekturtles]

Thanks for the PR! I started the automated checks and will try to review today.

[iliekturtles]

I've gotten through the first few files in my review so far.

• Why use 1.0/6.022_140_857e23 instead of 1.0/6.022_140_76e23? Floating point precision issues?
• I've included a diff below of changes to make singular/plural use consistent as well as some formatting fixes.

diff --git a/src/si/amount_of_substance.rs b/src/si/amount_of_substance.rs
index a9809e6..9a81850 100644
--- a/src/si/amount_of_substance.rs
+++ b/src/si/amount_of_substance.rs
@@ -41,8 +41,9 @@ quantity! {
         @attomole: prefix!(atto); "amol", "attomole", "attomoles";
         @zeptomole: prefix!(zepto); "zmol", "zeptomole", "zeptomoles";
         @yoctomole: prefix!(yocto); "ymol", "yoctomole", "yoctomoles";
-        /// One elementary entity may be an atom, a molecule, an
-        /// ion, an electron, any other particle or specified group of particles.
-        @particle: 1.0/6.022_140_857e23; "particle", "particle", "particles";
+
+        /// One elementary entity may be an atom, a molecule, an ion, an electron, any other
+        /// particle or specified group of particles.
+        @particle: 1.0_E0 / 6.022_140_76_E23; "particle", "particle", "particles";
     }
 }
diff --git a/src/si/catalytic_activity.rs b/src/si/catalytic_activity.rs
index d927ce3..c8d645c 100644
--- a/src/si/catalytic_activity.rs
+++ b/src/si/catalytic_activity.rs
@@ -78,7 +78,8 @@ quantity! {
         @yocto_enzyme_unit: prefix!(yocto) * prefix!(micro) / 6.0_E1;
             "yU", "yocto enzyme unit", "yocto enzyme units";
 
-        @particles_per_second:   1.0/6.022_140_857e23; "particles/s" ,"particle_per_second", "particles_per_second";          
+        @particle_per_second: 1.0_E0 / 6.022_140_76_E23; "particle/s", "particle per second",
+            "particles per second";
     }
 }
 
@@ -140,8 +141,7 @@ mod tests {
             test::<aos::zeptomole, t::minute, ca::femto_enzyme_unit>();
             test::<aos::yoctomole, t::minute, ca::atto_enzyme_unit>();
 
-            test::<aos::particle, t::second, ca::particles_per_second>();
-
+            test::<aos::particle, t::second, ca::particle_per_second>();
 
             fn test<AOS: aos::Conversion<V>, T: t::Conversion<V>, CA: ca::Conversion<V>>() {
                 Test::assert_approx_eq(
diff --git a/src/si/catalytic_activity_concentration.rs b/src/si/catalytic_activity_concentration.rs
index 6c8f1f8..60b3c48 100644
--- a/src/si/catalytic_activity_concentration.rs
+++ b/src/si/catalytic_activity_concentration.rs
@@ -274,8 +274,9 @@ quantity! {
         @femto_enzyme_unit_per_milliliter:
             prefix!(femto) * prefix!(micro) / 6.0_E1 / prefix!(milli) / prefix!(milli);
             "fU/mL", "femto enzyme unit per milliliter", "femto enzyme units per milliliter";
-        @particles_per_second_cubic_meter:
-            1.0/6.022_140_857e23; "particles · s⁻¹ · m⁻³", "particle per second cubic meter", "particles per second cubic meter";
+
+        @particle_per_second_cubic_meter: 1.0_E0 / 6.022_140_76_E23; "particle · s⁻¹ · m⁻³",
+            "particle per second cubic meter", "particles per second cubic meter";
     }
 }
 
@@ -411,7 +412,7 @@ mod test {
             test::<ca::pico_enzyme_unit, v::milliliter, c::pico_enzyme_unit_per_milliliter>();
             test::<ca::femto_enzyme_unit, v::milliliter, c::femto_enzyme_unit_per_milliliter>();
 
-            test::<ca::particles_per_second, v::cubic_meter, c::particles_per_second_cubic_meter>();
+            test::<ca::particle_per_second, v::cubic_meter, c::particle_per_second_cubic_meter>();
 
             fn test<CA: ca::Conversion<V>, U: v::Conversion<V>, C: c::Conversion<V>>() {
                 Test::assert_approx_eq(&CatalyticActivityConcentration::new::<C>(V::one()),

[crystal-growth]

Thank you very much!

1. It seems that I'm still using on obsolete value from CODATA2014: 6.022_140_857e23 in my notebook. 6.022_140_76e23 is the rights value from current CODATA, I'll change it.

In general it might be useful to have such basic constants like N_a defined in the library for internal use, to avoid repeating use of "magic numbers" and simplify updating the values. New CODATA2022 should arrive next year and we should be ready for it =)

2. Thank you, fixed the plural naming and formatting .

[iliekturtles]

Finally got a few minutes to finish up the review! Diff below or you can use https://github.com/crystal-growth/uom/compare/aos_particle_unit...iliekturtles:uom:aos_particle_unit.

Mostly formatting fixes again. I also updated electron volt per mole to the latest value.

Once fixes are applied please squash (or rebase into a set of logical commits) and add a more descriptive message. Something like the following taken from the PR submission and slightly amended:

Add new units based on amount of substance particle.

New definitions and tests added for `AmountOfSubstance`, `MolarEnergy`,
`MolarHeatCapacity`, `MolarConcentration`, `CatalyticActivity`, and
`CatalyticActivityConcentration`. Tests for `MolarEnergy` were amended
to be generic over the amount of substance units. Resolves #317.

diff --git a/src/si/amount_of_substance.rs b/src/si/amount_of_substance.rs
index 73a8812..9a81850 100644
--- a/src/si/amount_of_substance.rs
+++ b/src/si/amount_of_substance.rs
@@ -41,8 +41,9 @@ quantity! {
         @attomole: prefix!(atto); "amol", "attomole", "attomoles";
         @zeptomole: prefix!(zepto); "zmol", "zeptomole", "zeptomoles";
         @yoctomole: prefix!(yocto); "ymol", "yoctomole", "yoctomoles";
-        /// One elementary entity may be an atom, a molecule, an
-        /// ion, an electron, any other particle or specified group of particles.
-        @particle: 1.0/6.022_140_76e23; "particle", "particle", "particles";
+
+        /// One elementary entity may be an atom, a molecule, an ion, an electron, any other
+        /// particle or specified group of particles.
+        @particle: 1.0_E0 / 6.022_140_76_E23; "particle", "particle", "particles";
     }
 }
diff --git a/src/si/catalytic_activity.rs b/src/si/catalytic_activity.rs
index 9c4eaef..c8d645c 100644
--- a/src/si/catalytic_activity.rs
+++ b/src/si/catalytic_activity.rs
@@ -78,8 +78,8 @@ quantity! {
         @yocto_enzyme_unit: prefix!(yocto) * prefix!(micro) / 6.0_E1;
             "yU", "yocto enzyme unit", "yocto enzyme units";
 
-        @particle_per_second:   1.0/6.022_140_76e23; "particles/s" ,"particle_per_second",
-            "particles_per_second";
+        @particle_per_second: 1.0_E0 / 6.022_140_76_E23; "particle/s", "particle per second",
+            "particles per second";
     }
 }
 
@@ -143,7 +143,6 @@ mod tests {
 
             test::<aos::particle, t::second, ca::particle_per_second>();
 
-
             fn test<AOS: aos::Conversion<V>, T: t::Conversion<V>, CA: ca::Conversion<V>>() {
                 Test::assert_approx_eq(
                     &(AmountOfSubstance::new::<AOS>(V::one()) / Time::new::<T>(V::one())),
diff --git a/src/si/catalytic_activity_concentration.rs b/src/si/catalytic_activity_concentration.rs
index 05f280f..60b3c48 100644
--- a/src/si/catalytic_activity_concentration.rs
+++ b/src/si/catalytic_activity_concentration.rs
@@ -274,9 +274,9 @@ quantity! {
         @femto_enzyme_unit_per_milliliter:
             prefix!(femto) * prefix!(micro) / 6.0_E1 / prefix!(milli) / prefix!(milli);
             "fU/mL", "femto enzyme unit per milliliter", "femto enzyme units per milliliter";
-        @particle_per_second_cubic_meter:
-            1.0/6.022_140_76e23; "particles · s⁻¹ · m⁻³", "particle per second cubic meter",
-                "particles per second cubic meter";
+
+        @particle_per_second_cubic_meter: 1.0_E0 / 6.022_140_76_E23; "particle · s⁻¹ · m⁻³",
+            "particle per second cubic meter", "particles per second cubic meter";
     }
 }
 
diff --git a/src/si/molar_concentration.rs b/src/si/molar_concentration.rs
index 6091635..45234e1 100644
--- a/src/si/molar_concentration.rs
+++ b/src/si/molar_concentration.rs
@@ -144,21 +144,17 @@ quantity! {
             prefix!(femto) / prefix!(milli) / prefix!(milli);
             "fmol/mL", "femtomole per milliliter", "femtomoles per milliliter";
 
-        @particle_per_cubic_meter:
-            1.0/6.022_140_76e23;
-            "particles/m┬│", "particle per cubic meter", "particles per cubic meter";
+        @particle_per_cubic_meter: 1.0_E0 / 6.022_140_76_E23; "particle/m┬│",
+            "particle per cubic meter", "particles per cubic meter";
         @particle_per_cubic_decimeter:
-            1.0/6.022_140_76e23 / prefix!(deci) / prefix!(deci) / prefix!(deci);
-            "particles/dm┬│", "particle per cubic decimeter", "particles per cubic decimeter";
-        @particle_per_liter:
-            1.0/6.022_140_76e23 / prefix!(milli);
-            "particles/L", "particle per liter", "particles per liter";
-        @particle_per_deciliter:
-            1.0/6.022_140_76e23 / prefix!(deci) / prefix!(milli);
-            "particles/dL", "particle per deciliter", "particles per deciliter";
-        @particle_per_milliliter:
-            1.0/6.022_140_76e23 / prefix!(milli) / prefix!(milli);
-            "particles/mL", "particle per milliliter", "particles per milliliter";
+            1.0_E0 / 6.022_140_76_E23 / prefix!(deci) / prefix!(deci) / prefix!(deci);
+            "particle/dm┬│", "particle per cubic decimeter", "particles per cubic decimeter";
+        @particle_per_liter: 1.0_E0 / 6.022_140_76_E23 / prefix!(milli); "particle/L",
+            "particle per liter", "particles per liter";
+        @particle_per_deciliter: 1.0_E0 / 6.022_140_76_E23 / prefix!(deci) / prefix!(milli);
+            "particle/dL", "particle per deciliter", "particles per deciliter";
+        @particle_per_milliliter: 1.0_E0 / 6.022_140_76_E23 / prefix!(milli) / prefix!(milli);
+            "particle/mL", "particle per milliliter", "particles per milliliter";
     }
 }
 
@@ -233,7 +229,6 @@ mod test {
             test::<aos::picomole, v::milliliter, c::picomole_per_milliliter>();
             test::<aos::femtomole, v::milliliter, c::femtomole_per_milliliter>();
 
-
             test::<aos::particle, v::cubic_meter, c::particle_per_cubic_meter>();
             test::<aos::particle, v::cubic_decimeter, c::particle_per_cubic_decimeter>();
             test::<aos::particle, v::liter, c::particle_per_liter>();
diff --git a/src/si/molar_energy.rs b/src/si/molar_energy.rs
index d06cdb8..dbcb017 100644
--- a/src/si/molar_energy.rs
+++ b/src/si/molar_energy.rs
@@ -91,7 +91,7 @@ quantity! {
         @calorie_it_nutrition_per_mole: 4.186_8_E3; "Cal (IT)/mol", "Calorie (IT) per mole",
             "Calories (IT) per mole";
         @calorie_nutrition_per_mole: 4.184_E3; "Cal/mol", "Calorie per mole", "Calories per mole";
-        @electronvolt_per_mole: 1.602_177_E-19; "eV/mol", "electronvolt per mole",
+        @electronvolt_per_mole: 1.602_176_634_E-19; "eV/mol", "electronvolt per mole",
             "electronvolts per mole";
         @erg_per_mole: 1.0_E-7; "erg/mol", "erg per mole", "ergs per mole";
         @foot_poundal_per_mole: 4.214_011_E-2; "ft ┬╖ pdl/mol", "foot poundal per mole",
@@ -108,8 +108,11 @@ quantity! {
         @therm_us_per_mole: 1.054_804_E8; "thm/mol", "therm per mole", "therms per mole";
         @ton_tnt_per_mole: 4.184_E9; "t of TNT/mol", "ton of TNT per mole", "tons of TNT per mole";
         @watt_second_per_mole: 1.0_E0; "W ┬╖ s/mol", "watt second per mole", "watt seconds per mole";
-        @joule_per_particle: 6.022_140_76e23; "J / particle", "joule per particle", "joules per particle";
-        @electronvolt_per_particle:  1.602_176_634_E-19 * 6.022_140_76e23; "eV/particle", "electronvolt per particle", "electronvolts per particle";
+
+        @joule_per_particle: 6.022_140_76_E23; "J/particle", "joule per particle",
+            "joules per particle";
+        @electronvolt_per_particle: 1.602_176_634_E-19 * 6.022_140_76_E23; "eV/particle",
+            "electronvolt per particle", "electronvolts per particle";
     }
 }
 
@@ -157,69 +160,68 @@ mod tests {
         #[test]
         fn check_derived_units() {
             test::<e::yottajoule, aos::mole, me::yottajoule_per_mole>();
-            test::<e::zettajoule,aos::mole, me::zettajoule_per_mole>();
-            test::<e::exajoule,aos::mole, me::exajoule_per_mole>();
-            test::<e::petajoule,aos::mole, me::petajoule_per_mole>();
-            test::<e::terajoule,aos::mole, me::terajoule_per_mole>();
-            test::<e::gigajoule,aos::mole, me::gigajoule_per_mole>();
-            test::<e::megajoule,aos::mole, me::megajoule_per_mole>();
-            test::<e::kilojoule,aos::mole, me::kilojoule_per_mole>();
-            test::<e::hectojoule,aos::mole, me::hectojoule_per_mole>();
-            test::<e::decajoule,aos::mole, me::decajoule_per_mole>();
-            test::<e::joule,aos::mole, me::joule_per_mole>();
-            test::<e::decijoule,aos::mole, me::decijoule_per_mole>();
-            test::<e::centijoule,aos::mole, me::centijoule_per_mole>();
-            test::<e::millijoule,aos::mole, me::millijoule_per_mole>();
-            test::<e::microjoule,aos::mole, me::microjoule_per_mole>();
-            test::<e::nanojoule,aos::mole, me::nanojoule_per_mole>();
-            test::<e::picojoule,aos::mole, me::picojoule_per_mole>();
-            test::<e::femtojoule,aos::mole, me::femtojoule_per_mole>();
-            test::<e::attojoule,aos::mole, me::attojoule_per_mole>();
-            test::<e::zeptojoule,aos::mole, me::zeptojoule_per_mole>();
-            test::<e::yoctojoule, aos::mole,me::yoctojoule_per_mole>();
+            test::<e::zettajoule, aos::mole, me::zettajoule_per_mole>();
+            test::<e::exajoule, aos::mole, me::exajoule_per_mole>();
+            test::<e::petajoule, aos::mole, me::petajoule_per_mole>();
+            test::<e::terajoule, aos::mole, me::terajoule_per_mole>();
+            test::<e::gigajoule, aos::mole, me::gigajoule_per_mole>();
+            test::<e::megajoule, aos::mole, me::megajoule_per_mole>();
+            test::<e::kilojoule, aos::mole, me::kilojoule_per_mole>();
+            test::<e::hectojoule, aos::mole, me::hectojoule_per_mole>();
+            test::<e::decajoule, aos::mole, me::decajoule_per_mole>();
+            test::<e::joule, aos::mole, me::joule_per_mole>();
+            test::<e::decijoule, aos::mole, me::decijoule_per_mole>();
+            test::<e::centijoule, aos::mole, me::centijoule_per_mole>();
+            test::<e::millijoule, aos::mole, me::millijoule_per_mole>();
+            test::<e::microjoule, aos::mole, me::microjoule_per_mole>();
+            test::<e::nanojoule, aos::mole, me::nanojoule_per_mole>();
+            test::<e::picojoule, aos::mole, me::picojoule_per_mole>();
+            test::<e::femtojoule, aos::mole, me::femtojoule_per_mole>();
+            test::<e::attojoule, aos::mole, me::attojoule_per_mole>();
+            test::<e::zeptojoule, aos::mole, me::zeptojoule_per_mole>();
+            test::<e::yoctojoule, aos::mole, me::yoctojoule_per_mole>();
 
-            test::<e::petawatt_hour,aos::mole, me::petawatt_hour_per_mole>();
-            test::<e::terawatt_hour,aos::mole, me::terawatt_hour_per_mole>();
-            test::<e::gigawatt_hour,aos::mole, me::gigawatt_hour_per_mole>();
-            test::<e::megawatt_hour,aos::mole, me::megawatt_hour_per_mole>();
-            test::<e::kilowatt_hour,aos::mole, me::kilowatt_hour_per_mole>();
-            test::<e::hectowatt_hour,aos::mole, me::hectowatt_hour_per_mole>();
-            test::<e::decawatt_hour,aos::mole, me::decawatt_hour_per_mole>();
-            test::<e::watt_hour,aos::mole, me::watt_hour_per_mole>();
-            test::<e::milliwatt_hour,aos::mole, me::milliwatt_hour_per_mole>();
-            test::<e::microwatt_hour,aos::mole, me::microwatt_hour_per_mole>();
+            test::<e::petawatt_hour, aos::mole, me::petawatt_hour_per_mole>();
+            test::<e::terawatt_hour, aos::mole, me::terawatt_hour_per_mole>();
+            test::<e::gigawatt_hour, aos::mole, me::gigawatt_hour_per_mole>();
+            test::<e::megawatt_hour, aos::mole, me::megawatt_hour_per_mole>();
+            test::<e::kilowatt_hour, aos::mole, me::kilowatt_hour_per_mole>();
+            test::<e::hectowatt_hour, aos::mole, me::hectowatt_hour_per_mole>();
+            test::<e::decawatt_hour, aos::mole, me::decawatt_hour_per_mole>();
+            test::<e::watt_hour, aos::mole, me::watt_hour_per_mole>();
+            test::<e::milliwatt_hour, aos::mole, me::milliwatt_hour_per_mole>();
+            test::<e::microwatt_hour, aos::mole, me::microwatt_hour_per_mole>();
 
-            test::<e::btu_it,aos::mole, me::btu_it_per_mole>();
-            test::<e::btu,aos::mole, me::btu_per_mole>();
-            test::<e::btu_39,aos::mole, me::btu_39_per_mole>();
-            test::<e::btu_59,aos::mole, me::btu_59_per_mole>();
-            test::<e::btu_60,aos::mole, me::btu_60_per_mole>();
-            test::<e::calorie_it,aos::mole, me::calorie_it_per_mole>();
-            test::<e::calorie,aos::mole, me::calorie_per_mole>();
-            test::<e::calorie_15,aos::mole, me::calorie_15_per_mole>();
-            test::<e::calorie_20,aos::mole, me::calorie_20_per_mole>();
-            test::<e::calorie_it_nutrition,aos::mole, me::calorie_it_nutrition_per_mole>();
-            test::<e::calorie_nutrition,aos::mole, me::calorie_nutrition_per_mole>();
-            test::<e::electronvolt,aos::mole, me::electronvolt_per_mole>();
-            test::<e::erg,aos::mole, me::erg_per_mole>();
-            test::<e::foot_poundal,aos::mole, me::foot_poundal_per_mole>();
-            test::<e::foot_pound,aos::mole, me::foot_pound_force_per_mole>();
-            test::<e::kilocalorie_it,aos::mole, me::kilocalorie_it_per_mole>();
-            test::<e::kilocalorie,aos::mole, me::kilocalorie_per_mole>();
-            test::<e::quad,aos::mole, me::quad_per_mole>();
-            test::<e::therm_ec,aos::mole, me::therm_ec_per_mole>();
-            test::<e::therm_us,aos::mole, me::therm_us_per_mole>();
-            test::<e::ton_tnt,aos::mole, me::ton_tnt_per_mole>();
-            test::<e::watt_second,aos::mole, me::watt_second_per_mole>();
+            test::<e::btu_it, aos::mole, me::btu_it_per_mole>();
+            test::<e::btu, aos::mole, me::btu_per_mole>();
+            test::<e::btu_39, aos::mole, me::btu_39_per_mole>();
+            test::<e::btu_59, aos::mole, me::btu_59_per_mole>();
+            test::<e::btu_60, aos::mole, me::btu_60_per_mole>();
+            test::<e::calorie_it, aos::mole, me::calorie_it_per_mole>();
+            test::<e::calorie, aos::mole, me::calorie_per_mole>();
+            test::<e::calorie_15, aos::mole, me::calorie_15_per_mole>();
+            test::<e::calorie_20, aos::mole, me::calorie_20_per_mole>();
+            test::<e::calorie_it_nutrition, aos::mole, me::calorie_it_nutrition_per_mole>();
+            test::<e::calorie_nutrition, aos::mole, me::calorie_nutrition_per_mole>();
+            test::<e::electronvolt, aos::mole, me::electronvolt_per_mole>();
+            test::<e::erg, aos::mole, me::erg_per_mole>();
+            test::<e::foot_poundal, aos::mole, me::foot_poundal_per_mole>();
+            test::<e::foot_pound, aos::mole, me::foot_pound_force_per_mole>();
+            test::<e::kilocalorie_it, aos::mole, me::kilocalorie_it_per_mole>();
+            test::<e::kilocalorie, aos::mole, me::kilocalorie_per_mole>();
+            test::<e::quad, aos::mole, me::quad_per_mole>();
+            test::<e::therm_ec, aos::mole, me::therm_ec_per_mole>();
+            test::<e::therm_us, aos::mole, me::therm_us_per_mole>();
+            test::<e::ton_tnt, aos::mole, me::ton_tnt_per_mole>();
+            test::<e::watt_second, aos::mole, me::watt_second_per_mole>();
 
             test::<e::joule, aos::particle, me::joule_per_particle>();
             test::<e::electronvolt, aos::particle, me::electronvolt_per_particle>();
 
-
-            fn test<E: e::Conversion<V>,  A: aos::Conversion<V>, ME: me::Conversion<V>>() {
+            fn test<E: e::Conversion<V>, AOS: aos::Conversion<V>, ME: me::Conversion<V>>() {
                 Test::assert_approx_eq(&MolarEnergy::new::<ME>(V::one()),
                     &(Energy::new::<E>(V::one())
-                        / AmountOfSubstance::new::<A>(V::one())));
+                        / AmountOfSubstance::new::<AOS>(V::one())));
             }
         }
     }
diff --git a/src/si/molar_heat_capacity.rs b/src/si/molar_heat_capacity.rs
index 7403ba9..11a695e 100644
--- a/src/si/molar_heat_capacity.rs
+++ b/src/si/molar_heat_capacity.rs
@@ -88,9 +88,11 @@ quantity! {
             "kilocalorie (IT) per kelvin mole", "kilocalories (IT) per kelvin mole";
         @kilocalorie_per_kelvin_mole: 4.184_E3; "kcal/(K ┬╖ mol)", "kilocalorie per kelvin mole",
             "kilocalories per kelvin mole";
-        @joule_per_kelvin_particle: 6.022_140_76e23; "J /(K ┬╖ particle)", "joule per kelvin particle",
-            "joules per kelvin particle";
-        @electronvolt_per_kelvin_particle:   6.022_140_76e23 *  1.602_176_634_E-19; "eV/(K ┬╖ particle)", "electronvolt per kelvin particle",
+
+        @joule_per_kelvin_particle: 6.022_140_76_E23; "J/(K ┬╖ particle)",
+            "joule per kelvin particle", "joules per kelvin particle";
+        @electronvolt_per_kelvin_particle: 6.022_140_76_E23 * 1.602_176_634_E-19;
+            "eV/(K ┬╖ particle)", "electronvolt per kelvin particle",
             "electronvolts per kelvin particle";
     }
 }
@@ -99,7 +101,7 @@ quantity! {
 mod tests {
     storage_types! {
         use crate::num::One;
-        use crate::si::amount_of_substance as a;
+        use crate::si::amount_of_substance as aos;
         use crate::si::energy as e;
         use crate::si::molar_heat_capacity as m;
         use crate::si::quantities::*;
@@ -110,56 +112,56 @@ mod tests {
         fn check_dimension() {
             let _: MolarHeatCapacity<V> = Energy::new::<e::joule>(V::one())
                 / (TemperatureInterval::new::<t::kelvin>(V::one())
-                    * AmountOfSubstance::new::<a::mole>(V::one()));
+                    * AmountOfSubstance::new::<aos::mole>(V::one()));
         }
 
         #[test]
         fn check_units() {
-            test::<e::yottajoule, t::kelvin, a::mole, m::yottajoule_per_kelvin_mole>();
-            test::<e::zettajoule, t::kelvin, a::mole, m::zettajoule_per_kelvin_mole>();
-            test::<e::exajoule, t::kelvin, a::mole, m::exajoule_per_kelvin_mole>();
-            test::<e::petajoule, t::kelvin, a::mole, m::petajoule_per_kelvin_mole>();
-            test::<e::terajoule, t::kelvin, a::mole, m::terajoule_per_kelvin_mole>();
-            test::<e::gigajoule, t::kelvin, a::mole, m::gigajoule_per_kelvin_mole>();
-            test::<e::megajoule, t::kelvin, a::mole, m::megajoule_per_kelvin_mole>();
-            test::<e::kilojoule, t::kelvin, a::mole, m::kilojoule_per_kelvin_mole>();
-            test::<e::hectojoule, t::kelvin, a::mole, m::hectojoule_per_kelvin_mole>();
-            test::<e::decajoule, t::kelvin, a::mole, m::decajoule_per_kelvin_mole>();
-            test::<e::joule, t::kelvin, a::mole, m::joule_per_kelvin_mole>();
-            test::<e::decijoule, t::kelvin, a::mole, m::decijoule_per_kelvin_mole>();
-            test::<e::centijoule, t::kelvin, a::mole, m::centijoule_per_kelvin_mole>();
-            test::<e::millijoule, t::kelvin, a::mole, m::millijoule_per_kelvin_mole>();
-            test::<e::microjoule, t::kelvin, a::mole, m::microjoule_per_kelvin_mole>();
-            test::<e::nanojoule, t::kelvin, a::mole, m::nanojoule_per_kelvin_mole>();
-            test::<e::picojoule, t::kelvin, a::mole, m::picojoule_per_kelvin_mole>();
-            test::<e::femtojoule, t::kelvin, a::mole, m::femtojoule_per_kelvin_mole>();
-            test::<e::attojoule, t::kelvin, a::mole, m::attojoule_per_kelvin_mole>();
-            test::<e::zeptojoule, t::kelvin, a::mole, m::zeptojoule_per_kelvin_mole>();
-            test::<e::yoctojoule, t::kelvin, a::mole, m::yoctojoule_per_kelvin_mole>();
+            test::<e::yottajoule, t::kelvin, aos::mole, m::yottajoule_per_kelvin_mole>();
+            test::<e::zettajoule, t::kelvin, aos::mole, m::zettajoule_per_kelvin_mole>();
+            test::<e::exajoule, t::kelvin, aos::mole, m::exajoule_per_kelvin_mole>();
+            test::<e::petajoule, t::kelvin, aos::mole, m::petajoule_per_kelvin_mole>();
+            test::<e::terajoule, t::kelvin, aos::mole, m::terajoule_per_kelvin_mole>();
+            test::<e::gigajoule, t::kelvin, aos::mole, m::gigajoule_per_kelvin_mole>();
+            test::<e::megajoule, t::kelvin, aos::mole, m::megajoule_per_kelvin_mole>();
+            test::<e::kilojoule, t::kelvin, aos::mole, m::kilojoule_per_kelvin_mole>();
+            test::<e::hectojoule, t::kelvin, aos::mole, m::hectojoule_per_kelvin_mole>();
+            test::<e::decajoule, t::kelvin, aos::mole, m::decajoule_per_kelvin_mole>();
+            test::<e::joule, t::kelvin, aos::mole, m::joule_per_kelvin_mole>();
+            test::<e::decijoule, t::kelvin, aos::mole, m::decijoule_per_kelvin_mole>();
+            test::<e::centijoule, t::kelvin, aos::mole, m::centijoule_per_kelvin_mole>();
+            test::<e::millijoule, t::kelvin, aos::mole, m::millijoule_per_kelvin_mole>();
+            test::<e::microjoule, t::kelvin, aos::mole, m::microjoule_per_kelvin_mole>();
+            test::<e::nanojoule, t::kelvin, aos::mole, m::nanojoule_per_kelvin_mole>();
+            test::<e::picojoule, t::kelvin, aos::mole, m::picojoule_per_kelvin_mole>();
+            test::<e::femtojoule, t::kelvin, aos::mole, m::femtojoule_per_kelvin_mole>();
+            test::<e::attojoule, t::kelvin, aos::mole, m::attojoule_per_kelvin_mole>();
+            test::<e::zeptojoule, t::kelvin, aos::mole, m::zeptojoule_per_kelvin_mole>();
+            test::<e::yoctojoule, t::kelvin, aos::mole, m::yoctojoule_per_kelvin_mole>();
 
-            test::<e::btu_it, t::kelvin, a::mole, m::btu_it_per_kelvin_mole>();
-            test::<e::btu, t::kelvin, a::mole, m::btu_per_kelvin_mole>();
-            test::<e::btu_39, t::kelvin, a::mole, m::btu_39_per_kelvin_mole>();
-            test::<e::btu_59, t::kelvin, a::mole, m::btu_59_per_kelvin_mole>();
-            test::<e::btu_60, t::kelvin, a::mole, m::btu_60_per_kelvin_mole>();
-            test::<e::calorie_it, t::kelvin, a::mole, m::calorie_it_per_kelvin_mole>();
-            test::<e::calorie, t::kelvin, a::mole, m::calorie_per_kelvin_mole>();
-            test::<e::calorie_15, t::kelvin, a::mole, m::calorie_15_per_kelvin_mole>();
-            test::<e::calorie_20, t::kelvin, a::mole, m::calorie_20_per_kelvin_mole>();
-            test::<e::calorie_it_nutrition, t::kelvin, a::mole, m::calorie_it_nutrition_per_kelvin_mole>();
-            test::<e::calorie_nutrition, t::kelvin, a::mole, m::calorie_nutrition_per_kelvin_mole>();
-            test::<e::kilocalorie_it, t::kelvin, a::mole, m::kilocalorie_it_per_kelvin_mole>();
-            test::<e::kilocalorie, t::kelvin, a::mole, m::kilocalorie_per_kelvin_mole>();
+            test::<e::btu_it, t::kelvin, aos::mole, m::btu_it_per_kelvin_mole>();
+            test::<e::btu, t::kelvin, aos::mole, m::btu_per_kelvin_mole>();
+            test::<e::btu_39, t::kelvin, aos::mole, m::btu_39_per_kelvin_mole>();
+            test::<e::btu_59, t::kelvin, aos::mole, m::btu_59_per_kelvin_mole>();
+            test::<e::btu_60, t::kelvin, aos::mole, m::btu_60_per_kelvin_mole>();
+            test::<e::calorie_it, t::kelvin, aos::mole, m::calorie_it_per_kelvin_mole>();
+            test::<e::calorie, t::kelvin, aos::mole, m::calorie_per_kelvin_mole>();
+            test::<e::calorie_15, t::kelvin, aos::mole, m::calorie_15_per_kelvin_mole>();
+            test::<e::calorie_20, t::kelvin, aos::mole, m::calorie_20_per_kelvin_mole>();
+            test::<e::calorie_it_nutrition, t::kelvin, aos::mole, m::calorie_it_nutrition_per_kelvin_mole>();
+            test::<e::calorie_nutrition, t::kelvin, aos::mole, m::calorie_nutrition_per_kelvin_mole>();
+            test::<e::kilocalorie_it, t::kelvin, aos::mole, m::kilocalorie_it_per_kelvin_mole>();
+            test::<e::kilocalorie, t::kelvin, aos::mole, m::kilocalorie_per_kelvin_mole>();
 
-            test::<e::joule, t::kelvin, a::particle, m::joule_per_kelvin_particle>();
-            test::<e::electronvolt, t::kelvin, a::particle, m::electronvolt_per_kelvin_particle>();
+            test::<e::joule, t::kelvin, aos::particle, m::joule_per_kelvin_particle>();
+            test::<e::electronvolt, t::kelvin, aos::particle,
+                m::electronvolt_per_kelvin_particle>();
 
-
-            fn test<E: e::Conversion<V>, T: t::Conversion<V>, A: a::Conversion<V>, M: m::Conversion<V>>() {
+            fn test<E: e::Conversion<V>, T: t::Conversion<V>, AOS: aos::Conversion<V>, M: m::Conversion<V>>() {
                 Test::assert_approx_eq(&MolarHeatCapacity::new::<M>(V::one()),
                     &(Energy::new::<E>(V::one())
                         / (TemperatureInterval::new::<T>(V::one())
-                            * AmountOfSubstance::new::<A>(V::one()))));
+                            * AmountOfSubstance::new::<AOS>(V::one()))));
             }
         }
     }

[crystal-growth]

Thank you!

Now I need your advise with squashing: I've squashed all the commits into one commit with updated message in a new branch: https://github.com/crystal-growth/uom/tree/aos_particle_unit_squashed Should I create a new PR with this squashed branch?

[iliekturtles]

What I would do is force-push your new branch to the existing branch. Assuming your remote is named origin and the command line, the following will do this: git push origin aos_particle_unit_squashed:aos_particle_unit --force-with-lease.

If you end up having issues with this go ahead and open a new PR and we can close this one.

[crystal-growth]

Command line recipe worked without problems, thanks!

[iliekturtles]

Excellent. Thanks so much for the PR!

[crystal-growth]

Thank you very much for this great library!