Avogadro’s Law

by • 10/09/2013 • GeneralComments (0)667

Avogadro’s Law:


This law was presented by “Amadeo Avogadro” in 1811 in which he explained the relation between no of moles of gases and their volume.



According to Avogadro’s Law:

“At constant Temperature and pressure the volume of a gas is directly proportional to the no of moles or particles.”

Mathematical Representation:

Consider a gas present in a container with moles “n” volume “v” temperature “T” while constant pressure on a gas is “P”.

Now according to Avogadro’s Law:



∞ n


= constant x n


= Kn


= K



According to KMT

“The molecules of gases can exert pressure. By increasing the no of moles, no of particles also increases so that the pressure of gas on piston increases and piston more in upward direction to increase the volume of gas.


Molar Volume:

At STP the volume of 1 mole of any gas is always constant that is equal to 22.41 dm3 called molar volume.


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