2018-02-08 23:27 GMT+01:00 marc marc <marc_marc_...@hotmail.com>:

> in this case, steam is also not a substance :-)
> if you want to be a purist about words, it should be
> substance=water or air (or oil although I don't know any of them)
> usage=heat_transfer
> and for substance=water, state=liquid or steam/gas

Steam sounds more like a substance than heat (water in a precise state).
usage=* shouldn't overlap substance=* with values like *heat_*transfer,
there is usage=transmission already.
I don't really like substance + state, but it's only my point of view and I
understand the logic.

Pieter, substance=hot_heat isn't so great. substance=hot_water sounds
better don't you ?
Regarding the wiki page, it's appreciable you make the effort to document
tagging and ideas, proposal or not

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