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; 1 atm : = 1013.25 HPa = 1013.25 Mbar : = 101.325 KPa : = 760 Mm of Mercury ( MmHg ) : = 29.92126 Inch es of Mercury APPLICATIONS In Chemistry , standard temperature and pressure ( STP ) is defined as a reference temperature of 0 °C (273.15 K ) and pressure of 101.325 KPa (1 atm). In the United Kingdom , Scuba Diver s and others often use the word ''atmosphere'' loosely to mean 1 Bar (1000 millibars, or 100000 Pa ). The unit Technical Atmosphere (at) is roughly equal to the Gauge Pressure under 10 M of water; 1 at = 98066.5 Pa. |