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Avogadro's law

In 1811 the Italian chemist Amedeo Avogadro (1776-1856) put forward a hypothesis to explain why gases combine in simple ratios by volume. 

Avogadro's law

Avogadro's law states that that equal volumes of gases at the same temperature and pressure contain the equal number of molecules regardless of their chemical nature and physical properties. This means that as long as the temperature and pressure remain constant, the volume depends upon number of molecules of the gas or in other words, amount of the gas.

At constant T and P, the volume of a gas increases proportionately as its molar amount increases. If the molar amount is doubled, the volume is doubled.
Mathematically we can write
V n
V= K4n
The number of molecules in one mole of gas has been determined to be 6.022 ×1023 and is known as Avagadro constant.

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