We were discussing Boyle’s law and Charles law in our recent post, today we will see another very important topic i.e. Avogadro’s law with the help of this post and after that we will see P-V-T surface in thermodynamics.

As we know very well that there are basically four basic properties of gases and these are Volume, Pressure, Temperature and Amount in moles.

Avogadro’s law basically deals with the relationship between volume of gas and amount of moles of gas at constant temperature and constant pressure.

So, let us see here that what will be the relationship between volume of gas and amount of moles of gas at constant temperature and constant pressure according to Avogadro’s law.

Volume of the gas will be directionally proportional to the amount of moles of the gas at constant temperature and constant pressure.

We can also say that if amount of moles of gas will be increased then according to Avogadro’s law, volume of the gas will also be increased. At given temperature and pressure, equal volume of gas will contain equal numbers of moles of gas.

### Reference:

Engineering thermodynamics, By P. K. Nag
Engineering thermodynamics, By S. K. Som

We will see another important topic i.e. Stirling cycle and Ericsson cycle in the category of thermal engineering in our next posts.