Barometer is used to measure: A barometer is a meteorological instrument

A barometer is a meteorological instrument that measures air pressure in the atmosphere. Learn about the history, types, and functions of barometers, and how they are used to determine weather conditions and altitude. Discover the primary function of a barometer: measuring atmospheric pressure. Understand how this vital weather instrument works and its importance in forecasting. A barometer is a device used to measure atmospheric pressure. Because atmospheric pressure changes with distance above or below sea level, a barometer can also be used to measure altitude. There are two main types of barometers: mercury and aneroid. Learn more about barometers in this article. A barometer is a scientific instrument designed to measure barometric pressure. Barometers as we know them date back to 1643 when the Italian inventor Evangelista Torricelli measured air pressure using a glass tube filled with mercury and open on its downward-pointing end.