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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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Why does the answer here use $ \Delta S=Q/T$ even though this isn’t reversible? [closed]

This question for my thermodynamics course ends up using $\Delta S = Q_{\text{waste}} / T,$ but I was taught that $ \Delta S=Q/T$ is only valid if the process is reversible. The question makes it pre …
Katja Nell's user avatar