Air, just like a falling star, is drawn toward the earth by the force of gravity. This attraction gives air in the earth's atmosphere weight. One cubic foot of air, for example, weighs 0.075 lbs. Scientists can determine the weight of the air in the atmosphere by measuring its effect on a column of liquid mercury. This measured effect is atmospheric pressure in inches of mercury (inches Hg). The hectopascal (hPa) is another unit scientists use for measuring atmospheric pressure. One hectopascal equals 0.0295300586467 inches of mercury.
Instructions
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1
Write the value in inches mercury (inches Hg) you want to analyze. For example, "10 inches Hg."
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2
Multiply the number you have written by 33.86, using a calculator. For example, 10 x 33.86 = 338.6.
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3
Write your answer in the correct units. For example, "338.6 hPa."
