The number 6.022 × 10^{23} representing the number of atoms or molecules in a mole of any substance is called the Avogadro’s Number. One of the basic constants of chemistry is Avogadro’s Number. It helps one to compare the various atoms or molecules of the given substances where they have the same number of atoms or molecules.

It also makes it easy to calculate how much heavier a specific molecule of one gas is than that of another, so it is possible to determine the relative molecular weights of gases by measuring the weights of equivalent quantities.

As the Italian chemist, Amadeo Avogadro explained in 1811 that equivalent quantities of gasses at the same temperature and pressure produce the same number of molecules independent of their chemical composition and physical character. This number is Avogadro’s number (6.022 × 10^{23}). That is the amount of molecules of any gas contained in a volume of 22.41 L which is the same as a heavy gas such as carbon dioxide or bromine for the lightest gas (hydrogen).

Avogadro’s Number is very broad and the generally agreed value is

6.022 × 10^{23}. The scale of a number like that is incredibly ridiculous to envision. There are plenty of awe-inspiring examples to help imagine this number’s massive scale. like-

- The quantity of regular soft drink cans in an Avogadro can occupy the earth’s surface to a depth of over 200 miles.