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Avogadro's law is an experimental gas law relating the volume of a gas to the amount of substance of gas present. A modern statement is:
Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules."
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.

### Mathematical definition

### Historical account and influence