The millimetre of mercury (mm Hg) is one of the non-SI units used in the measurement of pressure. It is used because:

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2022-10-18

mercury is much denser than water so a much shorter tube can be used than if cm H2O was the unit.
one of the factors that determine pressure is the length of the object supplying the force.
a manometer that utilises mercury does not require an electrical power supply.
historically the first measurement of air pressure was made using a glass tube containing mercury.

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2022-10-18

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D: The best answer is the historical use of liquid mercury (hydrogyrum) to measure pressure. The reason that Hg was used is as stated in choice A.

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