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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!
The standard temperature is the freezing point of water and the standard pressure is one standard atmosphere. These can be quantified as follows: Standard temperature: 0Â°C = 273.15 K Standard pressure = 1 atmosphere = 760 mmHg = 101.3 kPa Standard volume of 1 mole of an ideal gas at STP: 22.4 liters.Standard pressure = 1 atmosphere = 760 mmHg = 101.3 kPa. Standard volume of 1 mole of an ideal gas at STP: 22.4 liters.he accurate masses of pure elements with their normal isotopic concentrations can be obtained from the periodic table. One mole of an ideal gas will occupy a volume of 22.4 liters at STP (Standard Temperature and Pressure, 0Â°C and one atmosphere pressure).