Staundart condeetions for temperatur an pressur

Staundart condeetions for temperatur an pressur are staundart sets o condeetions for experimental meisurments tae be established tae allae comparisons tae be made atween different sets o data. The maist uised staundarts are thir o the Internaitional Union o Pure an Applee'd Chemistry (IUPAC) an the Naitional Institute o Staundarts an Technology (NIST), awtho thir are nae universally acceptit staundarts. Ither organisations hae established a variety o alternative defineetions for thair staundart reference condeetions.

In chemistry, IUPAC could hae established twa staundarts:[1]


  1. A. D. McNaught and A. Wilkinson (1997). IUPAC. Compendium of Chemical Terminology (2nd ed.). Oxford: Blackwell Scientific Publications. ISBN 0-9678550-9-8. Standard conditions for gases: ... and pressure of 105 pascals. The previous standard absolute pressure of 1 atm (equivalent to 1.01325 × 105 Pa) was changed to 100 kPa in 1982. IUPAC recommends that the former pressure should be discontinued.