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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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How do you explain the fact that when air expands freely into an evacuated chamber from a co...

I can't see how this is any different from the Joule free expansion experiment with no temperature change. … This is the reason for the temperature increase. However wouldn't that logic also lead to a temperature increase in the joule free expansion? Any insight would be much appreciated. …
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