Standard Atmosphere

Real World Example

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.