This lesson examines the causes of varying barometric pressure and how we measure them. After this lesson, you should better understand where barometric pressure values come from and why we care.
Barometric Pressure, more commonly called atmospheric pressure, is the pressure exerted by the surrounding air in the atmosphere. It gets the name barometric pressure because it is measured with a barometer. Barometric pressure is commonly measured at all weather stations. Why is this such an important feature of understanding our climate and weather? As it turns out, minor variations in atmospheric pressure are tied to changing weather conditions.
In this lesson, we’re going to examine the science behind barometric pressure.First, we need to understand what barometric pressure is and why it changes. In another lesson in this series, we learn that altitude and barometric pressure are closely interrelated.
Atmospheric pressure decreases exponentially with higher altitude due to decreasing gravity with elevation and less overlying air pressing down.To incorporate all of the changes that occur with changes in altitude, the barometric pressure equation models the changes in air pressure with altitude. The barometric pressure equation is as follows: