What instrument is used to measure atmospheric pressure?

The instrument that measures atmospheric pressure is the barometer. This device operates based on the principle that changes in the atmospheric pressure will affect the height of a column of liquid in a tube or the elasticity of a diaphragm within the barometer. By measuring these changes, the barometer provides a direct indication of air pressure, which is crucial for weather forecasting and understanding atmospheric conditions.

Thermometers measure temperature, while anemometers are used to assess wind speed and direction. Hydrometers gauge the relative density or specific gravity of liquids. Each of these instruments serves a distinct purpose in meteorology, but the barometer is specifically designed to capture the nuances of atmospheric pressure changes. Understanding the role of the barometer is fundamental in weather studies, as it helps predict weather events and analyze atmospheric behaviors.