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If the temperature of the spoon is higher than the coffee, the coffee will heat up and the spoon will cool off.

If the temperature of the spoon is lower than of the coffee, the coffee will cool off and the spoon will heat up.

This is a perfect example of the first law of thermodynamics. The "law of conservation of energy" states that the total amount of energy in an isolated system remains constant; energy can neither be created nor destroyed, it can only be transformed from one state to another.

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14y ago
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11y ago

It will probably cool a little faster with the metal spoon in it if the handle sticks up far enough above the surface of the liquid. Stainless steel is a pretty good conductor of heat and thus will conduct heat from the liquid into the handle effectively. The handle will then provide extra surface area for the dissipation of heat from the liquid the spoon is in. The dissipation will be primarily by convection although stainless steel is reasonably good for radiative heat transfer - it just won't be as significant as the convective heat transfer.

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Q: Does a metal spoon help to cool a cup off a cup of coffee?
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