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
The sky appears blue because

The atmosphere scatters blue colour more than the others
It is actually blue
In white light, the blue component dominates
All colours interfere to produce blue

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