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Standard Temperature and Pressure (STP) Standard Temperature and Pressure (STP) is defined as 0 degrees Celsius and 1 atmosphere of pressure. Do not confuse STP with the STP Products Company, a maker of oil and fuel additives...unless you are reading one of their MSDS's!
STP stands for standard temperature and pressure. These standards have been set by the IUPAC. For STP conditions, the temperature is 237.15K and pressure is 1 bar.