How to calculate the length of mercury in a barometer?
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The pressure is quoted as the level of the mercury's height in the vertical column. Typically, atmospheric pressure is measured between 26.5 inches (670 mm) and 31.5 inches (800 mm) of Hg. One atmosphere (1 atm) is equivalent to 29.92 inches (760 mm) of mercury.
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Tie the barometer to one end and go up on the roof. Lower the barometer until it is exactly one inch above the ground. Holding the top of the rope at the top of the building, swing the barometer, and measure the period of the pendulum. From this you can calculate the length of the rope.
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