Here's why:
* Air Pressure and Storms: Storms form when there is a low-pressure area in the atmosphere. Air naturally flows from areas of high pressure to areas of low pressure. As air rises in a low-pressure area, it cools, condenses, and forms clouds. This rising air often leads to precipitation and potentially severe weather.
* Barometers and Air Pressure: A barometer measures air pressure. When the pressure decreases, the weight of the air pushing down on the mercury in the barometer also decreases, causing the mercury column to drop.
Therefore, a falling barometer is a sign of an approaching storm or low-pressure system.
