Multiply atmospheres by 14.6959
1 atm equals 101,325 pascals, the defined standard atmospheric pressure at sea level (15°C, dry air). 1 PSI equals 6,894.76 pascals. Dividing gives 14.6959 PSI per atm, usually written as 14.696 or 14.7. The conversion is exact at the definition level — atmospheric pressure in reality varies with weather and altitude, but the unit 'atm' is fixed by SI definition and does not change with conditions.
The atmosphere (atm) is a pressure unit historically defined as the average air pressure at sea level. Standardized at exactly 101,325 pascals, it remains useful in chemistry, scuba diving, and meteorology. PSI (pounds per square inch) is the everyday US pressure unit.
One atmosphere equals 14.696 PSI. The conversion comes up when reading chemistry papers that quote reaction pressures in atm, planning scuba dives where ambient pressure increases by one atm per ten meters of depth, or interpreting weather data where storm pressures vary fractions of an atmosphere.
Outside specialized fields, bar and PSI have largely replaced atm in industrial measurements.
Ambient pressure increases 1 atm every 10 meters of saltwater depth. Tank pressures listed in PSI need atm conversion when calculating gas consumption against depth-pressure schedules.
Papers and SDS sheets quote reaction or storage pressure in atm. Lab gauges and regulators read PSI. Convert to set up procedures accurately.
Pressure altimeters reference one standard atm. Pilot training tables mix units between atm, mb (millibars), and PSI when discussing service ceilings or cabin pressurization.
Soda saturation is specified in volumes-of-CO2 or atm of partial pressure. Force-carbonation home kegs and commercial systems calibrate in PSI.
Track-day setup guides for European cars sometimes list cold pressure in atm. Air gauges and compressors at most tracks read PSI.
1 atmosphere equals 14.696 PSI.
1 atmosphere is the average pressure at sea level, equal to 101.325 kPa or 14.696 PSI.