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How do you define "STP"?

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Quick Answer

The acronym "STP" stands for standard temperature and pressure, as defined by the International Union of Pure and Applied Chemistry. It is defined as a temperature of 273.15 degrees Kelvin and a pressure of 100 kilopascal, abbreviated as kPa.

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Full Answer

STP is used in chemistry when defining chemical attributes, such as density, that vary with changes in temperature and pressure. The related term standard ambient temperature and pressure, abbreviated as SATP, is defined as temperature of 298.15 degrees Kelvin and 100 kPa. Other chemical properties that change with the temperature and pressure include the boiling point and melting point. The temperature of STP can also be expressed as zero degrees Celsius or 32 degrees Fahrenheit.

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