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standard atmosphere
Symbol:  atm 
Category:  Pressure 
SI Equivalent:  1.01325×105 Pa
Dimension ML-1T-2 
System:  INT 
 
Notes
Unit of pressure equal that represents the air pressure at mean sea level. This unit is now defined as 101325 Pa.
Convert     atm  
1 atm =
Energy density
  Symbol Unit Name
2.71948  Btu (IT)/ft3  British thermal unit (IT) per cubic foot 
0.436596  Btu (IT)/gal (UK)  British thermal unit (IT) per gallon (UK) 
0.363542  Btu (IT)/gal (US)  British thermal unit (IT) per gallon (US) 
1.01325×105  J/m3  joule per cubic meter 
101.325  kJ/m3  kilojoule per cubic meter 
12.7329  MGOe  megagauss-oersted (MGOe) 
Pressure
  Symbol Unit Name
1.03323  at  atmosphere (metric) 
atm  atmosphere (standard) 
1.01325  bar  bar 
1.01325×106  barad  barad 
1.01325×106    barye 
76    centiHg (0°C) 
76  cmHg (0 °C)  centimeter of mercury (0°C) 
1033.26  cmH2O  centimeter of water (4°C) 
1.01325×106  dyn/cm2  dyne per square centimeter 
33.8995  ft H2O  foot of water (4°C) 
1.01325×10-4  GPa  gigapascal 
1013.25  hPa  hectopascal 
29.9213  inHg (0 °C)  inch of mercury (0°C) 
30.0028  inHg (15.56 °C)  inch of mercury (15.56°C) 
407.181  inH2O (15.56 °C)  inch of water (15.56°C) 
406.794  inH2O (4 °C)  inch of water (4°C) 
1.03323  kgf/cm2  kilogram force per square centimeter 
103.323  kgf/dm2  kilogram force per square decimeter 
1.03323×104  kgf/m2  kilogram force per square meter 
1.03323×10-2  kgf/mm2  kilogram force per square millimeter 
101.325  kPa  kilopascal 
1.46959×10-2  kip/in2, ksi, KSI  kilopound force per square inch 
0.101325  MPa  megapascal 
10.3424  mH2O, mCE (15.56 °C)  meter of water (15.56°C) 
10.3326  mH2O, mCE (4 °C)  meter of water (4°C) 
1.01325×106  µbar  microbar (barye, barrie) 
7.6×105  µHg (0 °C)  micron of mercury (millitorr) 
1013.25  mbar  millibar 
760  mmHg, torr, Torr (0 °C)  millimeter of mercury (0°C) 
1.03424×104  mmH2O, mmCE (15.56 °C)  millimeter of water (15.56°C) 
1.03326×104  mmH2O, mmCE (4 °C)  millimeter of water (4°C) 
7.6×105  mtorr  millitorr 
1.01325×105  N/m2  newton per square meter 
235.135  ozf/in2, osi  ounce force (av.) per square inch 
1.01325×105  Pa, N/m2  pascal 
2116.22  lbf/ft2  pound force per square foot 
14.6959  psi, PSI, lbf/in2  pound force per square inch 
6.80873×104  pdl/ft2  poundal per square foot 
472.828  pdl/in2  poundal per square inch 
0.94474  tonf/ft2 (UK)  ton force (long) per square foot 
6.56069×10-3  tonf/in2 (UK)  ton force (long) per square inch 
1.03323×10-3  tonf/cm2 (metric)  ton force (metric) per square centimeter 
10.3323  tonf/m2 (metric)  ton force (metric) per square meter 
1.05811  tonf/ft2 (US)  ton force (short) per square foot 
7.34797×10-3  tonf/in2 (US)  ton force (short) per square inch 
760  torr  torr 
Glossary