Standard Temperature and Pressure (STP)
A set of Standard conditions have been chosen to make it easier to quantify gas amounts (i,.e., “liters at STP”).
Standard Temperature = 00 C = 273.15 K
Standard Pressure = 1 atmosphere = 760 mm Mercury
At these “standard” conditions, if you have 1.0 mole of any ideal gas, it will occupy a “standard molar volume”: V = nRT/P =