The ideal gas law PV=nRT relates pressure, volume, moles and temperature of a gas.
R = 0.08206 L·atm/(mol·K). At STP (1 atm, 273.15 K), 1 mole of gas occupies 22.4 L.
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R is the ideal gas constant. R = 0.08206 L·atm/(mol·K) or 8.314 J/(mol·K).