A thermos keeps hot tea hot for hours

A thermos keeps hot tea hot for hours. Riya says a thermos is only for hot things; putting ice or cold water in it is pointless because a thermos is a "keep-hot" device. Is Riya right?

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More disagreements in Heat Transfer in Nature

Ramesh's mother says wet clothes dry faster on a windy day On a winter morning Meena touches the iron gate and the wooden door A fan feels cooling in summer In winter Sunita feels warm in a sweater Put a spoon in hot milk and the spoon soon turns hot On a hot day there are two ice cubes