What is an altimeter ? State its principle. How is it's scale calibrated ?

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Solution

An altimeter is a device used in aircraft to measure its altitude.

Principle: Atmospheric pressure decreases with the increase in height above the sea level; therefore, a barometer measuring the atmospheric pressure can be used to determine the altitude of a place above the sea level.

The scale of altimeter is graduated with increasing height towards left because the atmospheric pressure decreases with increase of height above the sea level.

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