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Avogadro's Law states that equal volumes of all gases, at the same temperature and pressure, contain an equal number of molecules.
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The volume occupied by one mole of any gas at standard temperature and pressure (STP).
A law stating that the pressure exerted by a gas is directly proportional to its absolute temperature and volume and inversely proportional to its amount in moles.
The constant in the ideal gas law with a value approximately equal to 8.31 J/(mol·K).