The instrument used to measure air pressure is called a barometer.

Quick Scoop: Short Answer

If someone asks, “what instrument is used to measure air pressure?” the clear textbook answer is:

  • Barometer – the standard instrument used to measure atmospheric (air) pressure.

A Bit More Detail

  • A barometer measures atmospheric pressure , often called barometric pressure.
  • It is widely used in weather forecasting , because changes in air pressure help predict short‑term weather changes.
  • There are different types, such as mercury barometers and aneroid barometers , but they are all forms of barometers.

Example: When air pressure drops quickly on a barometer, it often signals stormy or unsettled weather is on the way.

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