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they are both describing air pressure. One standard atmosphere is about equal to 760 mmHg. The origin of mmHg was from measuring the atmospheric pressure using Mercury, a heavy liquid metal. You can replace mercury with any non-volatile liquid, such as water. But you will need a lot more water to get the same answer; the density of mercury to that of water is 13.5 : 1, so 0.76 mHg will have to be replaced by 10.3 mH2O. You need a column of water of about 10.3 m high for measurement --how inconvenient.

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