The atmospheric pressure at sea level is ______ of Hg.

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76 Km

76 cm

76 mm

76 m

answer is C.

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Detailed Solution

Concept: The pressure imposed by the atmosphere due to its weight is known as atmospheric pressure. A barometer is a device that can be used to measure it. A mercury column in a barometer goes up and down based on atmospheric pressure at a given location. The unit for measurements from a barometer is mm Hg, and it is graduated in millimetres.
133.3224 Pa = 1 mm Hg
All barometer measurements are taken in this unit, hence option C is the proper solution to our query.
At sea level, the air pressure is 76 mm Hg.
Hence, option 3 is correct.

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