Barometric Pressure

Barometric pressure is the measure of an amount of density in a certain air mass.We measure it using barometers. The higher the density in a certain air mass the heavier it is. For example, hot air is less denser than cold air, so it rises above it. When high pressure (high density) occurs, it usually brings hot and sunny weather. When low pressure occurs, it usually brings cold, muggy weather. We'll learn more about that later though