In chemistry, IUPAC changed its definition of standard temperature and pressure in 1982: Until 1982, STP was defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 1 atm (101.325 kPa). Since 1982, STP has been defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 1 bar (100 kPa, 105 Pa).
In chemistry, IUPAC changed its definition of standard temperature and pressure in 1982: Until 1982, STP was defined as a temperature of 273.15 K (0 °C, 32 °F) and an absol?ute pre!ssure? of exactly 1 atm (101.325 kPa). Since 1982, STP has been defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 1 bar (100 kPa, 105 Pa).