In chemistry and other sciences, and. STP or standard temperature and pressure set of standard conditions for the measurement, an experimental comparison between a set of data makes it possible. Now, among all nations the conditions of STP defined by IUPAC nomenclature (International Union of chemistry pure and applied), the absolute pressure is 100 KPA (equivalent to 1 bar) and a temperature of 273 was 15 Kelvin (equivalent to zero degrees Celsius). Some organizations, another species of the definitions equivalent to the "standard conditions in terms of temperature and pressure" have accepted that the SATP is