Why is atmospheric pressure measured in units of length of the mercury column?
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"It is denoted by the symbol "mmHg". Although not an SI unit, the millimeter of mercury is still routinely used in medicine, meteorology, aviation, and many other scientific fields. One millimeter of mercury is approximately 1 torr, which is 1/760 of standard atmospheric pressure (101325760 =133.322368421 pascals).
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