1. n. [General Terms]

Abbreviation for standard temperature and pressure. Organizations establish a standard temperature and pressure to enable the comparison of datasets and to meet their members’ and stakeholders’ laboratory, industrial and regulatory requirements. For example, the International Union of Pure and Applied Chemistry (IUPAC) defines standard temperature to be 0°C [273.15°K, 32°F] and standard pressure to be 100 kPa [1 bar, 0.9869 atm, 14.504 psi] and the Society of Petroleum Engineers (SPE) defines standard temperature to be 15°C [288.15°K, 59°F] and standard pressure to be 100 kPa.

Alternate Form: standard temperature and pressure