The instrument that is used to measure atmospheric pressure is .

barometer

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thermometer

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tachometer

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anemometer

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Solution

The correct option is A barometer
A barometer is used to measure atmospheric pressure. The liquid used in barometer is mercury whose height varies with a change in atmospheric pressure.
Thermometer is a device used to measure temperature.
Tachometer is an instrument used for measuring the rotation speed of a shaft or disk in a motor or similar machines.
Anemometer is an instrument used for measuring the speed of wind.

Suggest Corrections

1.	Force per unit area	....................
2.	Liquids and gases together	....................
3.	An instrument to measure atmospheric pressure	....................
4.	An instrument used to measure pressure	....................