Standard Atmosphere

Real World Example

Imagine you're trying to inflate a balloon, but you need to make sure it doesn't pop. The pressure you need to apply to fill the balloon just right is similar to the pressure exerted by the standard atmosphere, which is enough to support a column of mercury 760 mm high. Just like you need to apply a specific force to inflate the balloon to the perfect size, the standard atmosphere represents the exact pressure needed to balance a mercury column at a height of 760 mm, equaling 101,325 Pa. In both scenarios, the balance of pressure is crucial—whether it's keeping a balloon from popping or supporting a mercury column at a precise height.