Question

Define atmospheric pressure. Write the name of instrument used to measure it.​

Answer 1

Answer:

the pressure exerted by the weight of the atmosphere, which at sea level has a mean value of 101,325 pascals (roughly 14.6959 pounds per square inch).

A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure.

Answer 2

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Atmospheric pressure is force per unit area exerted by an atmospheric column (that is, the entire body of air above the specified area).

Atmospheric pressure can be measured with a mercury barometer, which indicates the height of a column of mercury that exactly balances the weight of the column of atmosphere over the barometer.

Atmospheric pressure is expressed in several different systems of units: millimetres of mercury, pounds per square inch (psi), standard atmospheres, or kilopascals. Standard sea-level atmospheric pressure, by definition, equals 760 mm (29.92 inches) of mercury, 14.70 pounds per square inch, one standard atmosphere, or 101.325 kilopascals.