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
Why does bleeding occur through the nose in high mountainous regions ?

The blood pressure fluctuates and finally decreases drastically
The pressure at high altitudes is greater than that on the plains
The pressure of blood in capillaries is greater than the outside pressure
The blood pressure of a person increases at high altitudes

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