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 Originally Posted by DoubleJ
????
you're making this up now, surely?
just put a word-search in or something...no-one will read this far
I'm not making it up. And stop calling me Shirley.
It's the real deal. Google it.
The other 3 laws were worked out first, before someone realized that they didn't have any law that said "thermometers... they work".
The zeroth law basically states exactly that. A thermometer works by exchanging heat with the thing it's measuring until they are the same temp. The 2 objects are then in thermodynamic equilibrium. The thermometer has some scale and readout, so by knowing the temp of the thermometer, you know the temp of the thing you are measuring. If you then measure another thing and it measures the same temp on the thermometer, then it is the same temp as the first thing. LDO.
It was just so obvious that it was taken for granted.
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