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

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Physics
A standing wave occurs when

The speed of the wave is zero or near zero
Two waves overlap
The amplitude of a wave exceeds its wavelength
A wave reflects upon itself

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