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Standard Temperature &Pressure
Definition: (Stp) An arbitrary standard for measuring, for example, gas volumes, where the temperature is defined as 0 C (273.15 K) and the pressure is defined as 1 atm (101 325 Pa). The molar volume of an ideal gas at STP is 22.4 dm3 mol-1.
Source: The Penguin Dictionary of Science. London: Penguin, 2009. Credo Reference. Web. 08 August 2012.