A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. Common types include mercury barometers, which use a column of mercury to balance the weight of the atmosphere, and aneroid barometers, which use a sealed, flexible metal box that expands or contracts with pressure changes. Digital barometers, utilizing electronic sensors, are also increasingly prevalent.
Monitoring atmospheric pressure is fundamental to weather forecasting. Changes in pressure often signal approaching weather systems. A rapid drop in pressure typically indicates an impending storm, while a steady rise suggests fair weather. This knowledge allows meteorologists to predict weather patterns, issue warnings, and ultimately help communities prepare for impactful weather events. The invention and refinement of barometers revolutionized meteorology, providing a critical tool for scientific understanding and practical application in various fields, including aviation and navigation.