Physics
Rotameter is used to measure

Flow of fluids
Density of fluids
Velocity of fluid in pipes
Vortex flow

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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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