How does atmospheric pressure change with altitude?

Pressure varies with altitude as the density of air increases as we rise up.

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Pressure does not change with altitude.

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None of the above

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Pressure varies with altitude as the density of air decreases as we rise up.

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Solution

The correct option is D Pressure varies with altitude as the density of air decreases as we rise up.
Pressure at sea level is taken as 76 cm of a column of mercury, which is one atmosphere. But pressure varies with altitude as the density of air decreases as we rise up and air becomes rarer. For every 105 m rise in height, pressure decreases by 1 cm of the mercury column

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