Oh, dude, it's like this science thing where they decided that 760 mm Hg is the same as 1 atmosphere. I mean, who even measures pressure in millimeters of mercury anyway? But yeah, they just agreed on it, so now we all gotta go along with it. Science, man, it's a trip.
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760 mmHg is equal to 1 atmosphere because it is the average atmospheric pressure at sea level. This relationship was established by Torricelli's experiments with Mercury in a barometer, which led to the definition of the standard atmosphere as the pressure needed to support a column of mercury 760 mm high.
By definition 1 ATM is the air pressure at sea level. The pressure at sea level also corresponds to the amount of air pressure that will support a column of mercury 760 mm high at 0 degrees Celsius under standard gravity, or 14.7 pounds per square inch (1.01325 × 105 pascals). Consequently, 1 ATM = 760 mm Hg.
The reading is as x mm of mercury, as this is the amount of mercury the pressure can hold up - against gravity - when the pressure is tested using any necessary equipment
760 mm Hg is 1 atmosphere, so approx 1 bar. It is 1.013 bar, which is 1013 milibars.
790 mm Hg is equal to approximately 1.04 atmospheres.
150 mm Hg is the same as 2.90 PSI: 1 atmosphere == 760 mm Hg, so 150 mm Hg is the same as 0.197 atm. 1 atmosphere = 14.696 PSI so (0.197)(14.696) = 2.90 PSI
All other factors being equal, the height of the column in a barometer is inversely related to the density of the material in that column. So we can write H = h (Rho/rho); where h = 745 mm Hg, H = ? mm in water, Rho = 13550 kg/m^3 Hg density and rho = 997 kg/m^3 water density. So we have H = 745*(13550/997) = 10125.12538 mm ~ 10.1 m when all other factors are equal. ANS.
0 mmHg is equivalent to 0 psia because both represent a pressure of zero relative to absolute vacuum. However, 760 mmHg is equal to 14.7 psia, not 0 psig. 760 mmHg is equivalent to atmospheric pressure, which is the reference point for psig.