standard atmospheric pressure is....
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option a) 76mm of mercury b) 76m of mercury c) 101.3pa d) 101.3kpa
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Standard sea-level pressure, by definition, equals 760 mm (29.92 inches) of mercury, 14.70 pounds per square inch, 1,013.25 × 103 dynes per square centimetre, 1,013.25 millibars, one standard atmosphere, or 101.325 kilopascals.
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option a) 76mm of mercury b) 76m of mercury c) 101.3pa d) 101.3kpa
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The Earth's surface is covered with a layer of atmosphere, with more than 99% of the atmosphere lying within 31 km of the surface. The weight of the atmosphere exerts a downward thrust on any surface lying within it. This gives rise to atmospheric pressure. The atmospheric pressure at any height above the Earth's surface is the weight of a column of air of unit cross section from that altitude to the top of the atmosphere.
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