Standard temperature and pressure

reference values for temperature and pressure

In order to be able to reproduce experiments, standard conditions for temperature and pressure have been defined in different fields of science. Very often these are also called standard temperature and pressure. The table below gives some examples:

Domain Temperature Pressure Defined by
Physics 273.15 K (0 °C, 32 °F)[1] 101.325 Pa DIN 1343
Chemistry 298.15 K = 25 °C[2] 1 bar / 100 kPa IUPAC
Airline industry 15 °C 1013,25 hPa, at sea level


  1. 'Numericals in Chemistry', Competition Science Vision, Year 2, Issue 17 (July 1999), p. 629
  2. Applied Bioremediation and Phytoremediation, eds. Ajay Singh; Owen P. Ward (Berlin: Springer, 2004), p. 97