Put a spoon in hot milk and the spoon soon turns hot
Put a spoon in hot milk and the spoon soon turns hot. Kabir says the spoon's coldness went into the milk, so the milk got colder and the spoon got hot. Is it right to say "coldness flowed from the spoon into the milk"?
Who do you think is right? Pick one.
The answer: No — heat flowed from milk to spoon
Why
Kabir's got the result right — the spoon warms, the milk cools a little — so his story sounds fine. The slip is treating 'coldness' as a thing that flows. Cold isn't a substance; it's just having LESS heat. Only heat moves, and it always travels from the hotter thing to the cooler one until they match. Here heat flows FROM the milk INTO the spoon: that's why the spoon warms and the milk dips. Saying 'coldness went in' points the wrong way — nothing cold travelled; heat left the milk. Test: a cold spoon in hot milk warms up, but a hot spoon in cold milk cools down — heat always leaves the warmer side, cold never 'flows'. He's not right: only heat moves, from hot to cold — the spoon got hot because milk's heat entered it, not because coldness left.
On Socho, you explain your thinking out loud and a coach asks about YOUR reasoning — one question a day, free, in Hindi, Hinglish or English.
Try a question on Socho →More disagreements in Heat Transfer in Nature