Aneroid Barometer

An aneroid barometer is a device used to measure atmospheric pressure. It consists of a sealed metal chamber, called an aneroid cell, which is partially evacuated of air. As the atmospheric pressure changes, the aneroid cell expands or contracts, causing mechanical movements that are then translated into pressure readings on a dial.

Unlike a mercury barometer, which uses a column of mercury to measure pressure, an aneroid barometer is portable and does not require any liquid. It is commonly used in weather forecasting, aviation, and other applications where accurate pressure measurements are needed.

Aneroid barometers are typically calibrated in units of pressure such as inches of mercury (inHg) or millibars (mb). They are often found in homes, offices, and weather stations to monitor changes in atmospheric pressure, which can indicate changes in weather patterns.