Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Two thin shirts become thicker so prevent transmission of heat
No radiation of heat takes place
Air layer between two shirts behaves like insulating media
Air layer between two shirts works as good conductor

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Physics
A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

The carpet is a better conductor of heat than the stone
The human body maintains a constant temperature
The floor and carpet are at different temperatures
The stone conveys the heat away from the feet more rapidly than the carpet

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