Christof Gessner

As I'm looking at it, three remarks: - UCUM Paragraph 14 Number 2 says "All customary units shall be enclosed completely by square brackets". Strictly applying this would yield `[Torr]`,...

I am ready to join such a meeting. In the first place it will be adjusting mutual expectations, I believe.

The new SI redefinition moves from explicit-unit to explicit-constant definitions ( see https://en.wikipedia.org/wiki/2019_redefinition_of_the_SI_base_units ). This should be reflected in giving the seven constants chosen by SI some special rank (e....

Regarding the discussion on the nature of the "mole", here is a somewhat different take on the semantics of units in general. For this purpose I will look at the...

Note that the base units will remain being base units, not derived units. No change. The change is that even as being base units, they will receive a definition, i....

And yes, following your matrices approach with the "inner" and "outer" base, this is probably consistent with what I want to say. In other words: Being a "base unit" would...

My understanding is that those seven constants will NOT change in the future. The SI brochure states "The numerical values of the seven defining constants have no uncertainty." Any advances...

Choosing the base for the dimension vector was always possible, this will not change. And choosing a different base always introduces "wiggle" in some of the numerical values (while others...

Hi Gunther, it is not the measurement that is exact, it is the numerical value of "c" that scales the speed of light measurement to "m/s" that is fixed per...

The SI transition is well explained here: https://en.wikipedia.org/wiki/2019_redefinition_of_the_SI_base_units. Neither the definition of the meter nor the second was changed by this recent transition. The fact that "c" has a fixed...