Standard Atmosphere
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Standard Atmosphere:
Imagine you're trying to squeeze into a crowded elevator. Just as the number of people determines the pressure inside the elevator, the weight of the air above us determines atmospheric pressure. The concept of a standard atmosphere is like saying that a certain number of people in the elevator is equivalent to a specific pressure, just as the weight of air that supports a 760 mm column of mercury or exerts 101,325 Pa is defined as one atmosphere.
Practice Version
Standard Atmosphere: A unit of pressure equal to 101,325 Pa, or which supports a 760 mm column of mercury. Standard atmosphere. It is the average pressure at sea level on Earth.