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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!
Best Answer: STP is Standard Pressure and Temperature, where pressure equals 1 atm and temperature equals 273 K. The other answer is right too, there are different ways in which STP is used, I'm just using the definition I learned in college. Standard Conditions For Gas Measurements. NIST uses 20C and 14.696 psi, but use is not widespread. The International Satandard metric conditions are 15C and 101.325kPa; These conditions are used extensively for gas sales in S E Asia.