Which instrument is used to measure air pressure?

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Multiple Choice

Which instrument is used to measure air pressure?

Explanation:
Air pressure is measured with a barometer. A barometer detects atmospheric pressure—the weight of the air pressing down on us. In a mercury barometer, higher pressure pushes the mercury higher, while lower pressure lets it fall; in modern versions, aneroid cells flex with pressure to move a dial. This measurement helps with weather forecasting because rapidly dropping pressure often signals an approaching storm. Other tools measure different properties: an anemometer measures wind speed, a hygrometer measures humidity, and a thermometer measures temperature, so they aren’t used to gauge air pressure.

Air pressure is measured with a barometer. A barometer detects atmospheric pressure—the weight of the air pressing down on us. In a mercury barometer, higher pressure pushes the mercury higher, while lower pressure lets it fall; in modern versions, aneroid cells flex with pressure to move a dial. This measurement helps with weather forecasting because rapidly dropping pressure often signals an approaching storm. Other tools measure different properties: an anemometer measures wind speed, a hygrometer measures humidity, and a thermometer measures temperature, so they aren’t used to gauge air pressure.

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