I first noticed this with my mum and how pouring a cup of tea into another empty cup, then pouring it back into the first cup, and vice versa cools it down quite fast. Why?
FYI I am decently knowledgeable in heat transfer and thermodynamics
In: Physics
Besides the air cooling it down, the cup which is empty at the end will have an increased temperature once you are done (so this is where some of the heat went).
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