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

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

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Physics
Superconductors are those elements

Whose resistance falls almost to zero at very low temperatures
Which turn into insulators at very low temperatures
Whose conductivity is intermediate between metals and insulators
Which conduct electricity only at super-high temperatures

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