Physics
Metals are good conductors of electricity because:

The atoms are lightly packed.
They contain free electrons.
All of these
They have high melting point.

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

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

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