Which of the following equals 1 atm pressure?

860 cm of Hg

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86 cm of Hg

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76 cm of Hg

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760 cm of Hg

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Solution

The correct option is C
76 cm of Hg

Atmospheric pressure is measured by a barometer and barometer's height at normal temperature and pressure at sea level is 76 cm of Hg or 760 mm of mercury, which represents 1 atm.

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