Q.

What happens to atmospheric pressure with increase in altitude?

A. It remains constant
B. It decreases
C. It increases
D. It constantly fluctuates
Answer» B. It decreases
Explanation: In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the mass of air above the measurement point. Low-pressure areas have less atmospheric mass above their location, whereas high-pressure areas have more atmospheric mass above their location. Likewise, as elevation increases, there is less overlying atmospheric mass, so that pressure decreases with increasing elevation.
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