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In chemistry, standard conditions for temperature and pressure (informally abbreviated as STP, Standard Temperature Pressure) there are two (slightly different) standard sets of conditions for experimental measurements, to allow comparisons to be made between different sets of data.

Two different standards:

  • IUPAC's version of standard is a temperature of 0 °C(273.15 K, 32 °F) and an absolute pressure of 100kPa (14.504 psi, 0.986 atm)
  • NIST's version is a temperature of 20 °C (293.15 K, 68 °F) and an absolute pressure of 101.325 kPa (14.696 psi, 1 atm).
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STP is equal to 1/273k

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Q: Standard temperature and pressure are equal to?
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