alleryAtmospheric pressure at a point equals the weight of what?
AAir above a unit area
BWater vapour in the air
CWind blowing across it
DAir below a unit area
Answer & Solution
Correct answer: A. Air above a unit area
1. Pressure is force per unit area.
2. For air it is the total weight of the air above a unit area at that point.
3. This is why pressure falls as you climb, because less air lies above.
_Source: Wikipedia, Atmosphere of Earth, Pressure and thickness_
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