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It's the physical property that indicates the degree/intensity of heat present in a substance or an object. It can be expressed and measured according to various scales.

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Is there an "absolute hot"?

This only happens in bounded systems, because the ±∞K temperature has maximum entropy and getting hotter from that point onwards reduces the entropy. … In an unbounded system, making something hotter always increases entropy, so the temperature never wraps around. …
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3 votes

If temperature is proportional to average kinetic energy, then is the air around me actually...

I'm simplifying: if the atoms hit hard enough either the table atom breaks away or the table atom and air atom stick together, but that's more about why water evaporates than why tables can be the same temperature
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