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Which unit of pressure is derived from the early barometers used to measure pressure?
mmHg
bar
Pa
atm
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mmHg
Explanation: Early barometers (Torricelli) used a column of mercury, so pressure was measured by the height of mercury. The unit mmHg (or torr) directly reflects that measurement (1 atm = 760 mmHg).
Explanation: Early barometers (Torricelli) used a column of mercury, so pressure was measured by the height of mercury. The unit mmHg (or torr) directly reflects that measurement (1 atm = 760 mmHg).
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