Gaslaws Boyles:

Gases do not have definite shape or definite volume. it occupies the whole space which is available. the inter molecular space is very large. So they move in all possible directions the binding forces between the molecules are very weak. so the molecules of gas move with high speed hence the kinetic energy increases.

Certain rules when the gas follows when subjected to a change in temperature, pressure or volume.Temperature represents the average kinetic energy possessed by a molecule. When The temperature is increased kinetic energy increases.Average force exerted by the bombardment of gas molecules per unit area of the container is called pressure of the gas. The space occupied by the fixed mass of a gas is volume.

Boyles's law:

Temperature remaining constant the pressure of a given mass of a gas is inversely proportional to its volume,Keeping the pressure constant when the temperature is increased the volume also correspondingly increases.Keeping the pressure constant when the temperature is decreased volume also decreases correspondingly.

Charles law:

Pressure remaining constant the volume of a given mass of a gas is directly proportional to its absolute temperature.The volume of a given mass of a gas changes directly with temperature and inversely with pressure.Volume can be compared only when they are at fixed temperature and pressure. Which is mentioned as STP(Standard temperature and pressure).Standard temperature is 0degree celcius (273Kelvin).Standard pressure is 760mm pressure.

Gay-Lussac's law:

When gases react they do sop involumes which bear a simple whole number ration to one another and to the volumes of the product , if gaseous, provided the temperature and the pressure of the reacting gases and their products remain constant.

Avogadro's law:

Equal volumes of all gases under the same conditions of temperature and pressure contain the same number of molecules.Gases and misture of gases like carbon dioxide and sulphur di oxide behave with regard to temperature and pressure.

Gas equation:

It is an equation used in chemical calculations to calculate the change in volume of a gas when pressure and temperature both undergoes a change., then there will be a simultaneous effect of changes of temperature and pressure on the volume of a given mass of dry gas. It is obtained by applying both Charles and Boyle's law.

Applying Boyle's law:

V is proportional to 1/P at constant temperature

Applying charle's law V is proportional to T (pressure is constant)

On combination of these two laws the volume of a given mass of a gas varies inversely to pressure and directly to temperature.

V Is proportional 1/P x T

V = K/P X T

PV/T = K which is a gas equation.