I decided, following consulation with @marqh, that both this and the name "temperature" (above, line 77) are not sensible defiinitions and **should simply be removed**.
Conceivably this may cause someone problems, but I frankly doubt it, and the most practical way to find out is arguably just to do it + see if anyone complains.
Certainly, the possibility that this may cause someone a problem is not an argument for always leaving functionality as it is, if it is plainly "wrong".  In principle, this is no different from our decision that these translations can no longer accept any-old units, which this change is also doing.