Standard conditions for Temperature and Pressure (STP)

Standard conditions for temperature and pressure (STP) are standard sets of conditions for experimental measurements to be established to allow comparisons to be made between different sets of data. STP should not be confused with the standard state of a material (pure substance, mixture, or solution) which is a reference point used to calculate its properties under different conditions.

The most used standards are those of the International Union of Pure and Applied Chemistry (IUPAC) and the National Institute of Standards and Technology (NIST), although these are not universally accepted standards. Other organizations have established a variety of alternative definitions for their standard reference conditions.

Standard Temperature and Pressure defined by NIST

  • Standard temperature is 0 ℃ or 273.15 K or 32 ℉.
  • Standard pressure is 1 atm or 101.325 kPa or 760 mmHg (or torr) or 14.6959 psi.

Standard Temperature and Pressure defined by IUPAC

  • Standard temperature is 0 ℃ or 273.15 K or 32 ℉.
  • Standard pressure is 1 bar or 100.000 kPa or 750.6 mmHg (or torr) or 14.5038 psi.
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