Gas Laws - Boyle's Law

Gas laws were always been an important aspect in all terms of physics. This has been explained by kinetic-theory-of-gases as well as Boyle's Law. Let me help you go through basically on Gas laws - Boyle's Law.
First let me help you understand what is Gas laws - The study of behaviour of gases has led to the formulation of a few important generalisations called as Gas Laws.
Boyle's Law -
Robert Boyle proposed this law in the year 1662, giving the relationship between pressure and volume of given mass of a gas at constant temperature. This law states that volume (V) of a given mass of gas is inversely proportional to the pressure (P) at constant temperature.

Let me also try to explain on mathematical terms.

Example - The density of water is 1000 kg m–3. The density of water vapour at 100 °C and 1 atm pressure is 0.6 kg m–3. The volume of a molecule multiplied by the total number gives ,what is called, molecular volume. Estimate the ratio (or fraction) of the molecular volume to the total volume occupied by the water vapour under the above conditions of temperature and
pressure.

Answer - For a given mass of water molecules, the density is less if volume is large. So the
volume of the vapour is 1000/0.6 = /(6 ×10 -4 ) times larger. If densities of bulk water and water molecules are same, then the fraction of molecular volume to the total volume in liquid
state is 1. As volume in vapour state has increased, the fractional volume is less by the
same amount, i.e. 6×10-4.

I hope this was more helpful to you. May be in the next lesson .. let me help you go through on Physical Properties of Water keep reading and leave your valuable comments.