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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!
Some textbooks define it differently than others, but the newest IUPAC standard temperature and pressure are: #t_stp = 0^@ c = 273.15 k# #P_STP = 1 bar#