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Avogadro's law  is an experimental gas law relating volume of a gas to the amount of substance of gas present. A modern statement of Avogadro's law is:

For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.

which can be written as:

or

where:

V is the volume of the gas

n is the amount of substance of the gas

k is a constant