At 10:48 +0000 02/09/4, Barbara and/or Bill Hooper wrote: >I have always found it difficult to understand how the mole can be >considered a unit of anything, photons or otherwise. (I admit that SI does >indeed define it as a unit. But that doesn't mean that I understand it.)
I sympathize with your anxiety, Bill, but the wording of para 2.1.1.6 (page 97) of the BIPM Bible should bring you some relief... Sure, the mole is just a number, and theoretically you can use it to measure everything. But yourself give reasons for limiting its use to elementary particles, or even better (I used to be a chemist!) to relate amounts of one chemical substance to another. Louis
