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An aneroid barometer is a device used to measure atmospheric pressure and display current readings. It operates using a vacuum chamber, called an aneroid (which means "without liquid," distinguishing it from earlier liquid-based barometers that used water or mercury). Changes in atmospheric pressure cause the vacuum chamber to deform slightly, either expanding or contracting. The deformation is transmitted mechanically through a spring and rocker shaft, which moves a needle on the barometer's dial. The needle indicates the current pressure, typically calibrated in units such as hectopascals (hPa).
