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Why do we always talk of heat flow from a hotter region to a coder region? Would it be wrong to say that cold flows from one place to another?

The Cryptic Cat
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This question is similar to the concept of electricity flowing in the same direction as electrons. If we didn't know about electrons being involved with how electricity flows, we might have never changed the historical convention of what direction electricity flows in.

In the case of your question, there is no reason why we couldn't conceptually treat entropy as "the flow of negative or lesser heat energy" instead of "the flow of [positive] energy". But the convention is to think of energy flow from higher heat energy locations to lower heat energy locations since we know that heat energy is actually a real substance (and has mass!).

Mark Ripley
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