Physics
At constant pressure, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. It is the statement of

Boyle's Law
Avogadro's Law
Gay-Lussac's Law
Charle's Law

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

metals are good conductor of heat
metals have higher thermal capacity than plastics
plastics have a lower density than metals
plastics have a higher thermal conductivity than metals

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