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

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

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Physics
Skating on ice is possible because

The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
Ice is cold
The surface of ice is smooth
The pressure on the ice due to skate raises its melting point

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