Standard atmosphere (symbol = atm) is a unit of pressure defined as 101,325 Pa, 760 mmHg, 101.325 kPa, 1.01325 bar, 760 torr, 4.6959 psi, or 1 ata (atmosphere absolute). Definition: What is standard atmosphere (atm)? The mmHg unit is commonly used in medicine (blood pressure), meteorology (weather reports), aviation (cabin pressure), and other scientific fields.ฤก mmHg is equal to 1/760 standard atmospheres (atm) or, in SI units, 133.322 Pa (Pascals). You will most frequently see mmHg used in blood pressure readings and weather reports from meteorologists. Millimeters of mercury (symbol = mmHg) is a manometric unit of pressure equal to the pressure exerted by a column of mercury that is one millimeter high under standard gravity. Definition: What is mmHg? (Millimeter mercury)
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