Low pressure refers to a condition where the atmospheric pressure is lower than the surrounding areas. This often occurs in weather systems, leading to the formation of clouds and precipitation. Low pressure systems are typically associated with stormy weather, as they allow air to rise and cool, resulting in moisture condensing into rain or snow. In meteorology, low pressure is measured in units like millibars or inches of mercury. These systems can influence local climates and are crucial for understanding weather patterns. Areas of low pressure are often marked on weather maps with the symbol "L," indicating potential changes in weather conditions.