A barometer is an instrument used to measure atmospheric pressure. It helps in forecasting weather and determining altitude. There are two main types of barometers: 1. **Mercury Barometer**: This consists of a glass tube filled with mercury, which is inverted into a dish of mercury. As atmospheric pressure changes, it causes the mercury level in the tube to rise or fall. The height of the mercury column is measured in millimeters or inches and corresponds to the atmospheric pressure.
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