gas laws

What are Gas laws? Types of Gas law | Application | Ideal gas law |Boyle’s law | Charle’s law | Gay lussac law |

What are gas laws?

Gas laws are a group of laws that govern the behaviour of gases by providing relationships with volume, pressure, temperature, and no. of molecules.

Some of the important gas laws are:

Boyle’s law

Boyle’s law gives the relationship between a gas’s pressure and volume at a constant temperature. Basically, at constant temperature the volume of a gas is inversely proportional to the pressure of a gas at a constant temperature.

Example: Syringe- When we press the plunger the pressure increases due to which the volume decreases.

boyles law

Charles law

Charles law states that at constant pressure, the volume of a gas is directly proportional to the temperature. (in kelvin) in a closed system. Basically, this law describes the relationship between the temperature and volume of the gas.

For example; a ballon in a warm room, if we take the ballon outside where the temperature is less then we will see that the ballon is shrinking. It’s because as the temperature reduces the volume of gas got reduced and when the ballon is brought back to the warm room we will see that the ballon is expanding.

charles law

Gay Lussac law

Gay Lussac law is a type of gas laws which gives the relationship between temperature and pressure at a constant volume. The law states that at a constant volume, the pressure of the gas is directly proportional to the temp, for a given gas.

For example, when heat is applied on a pressure cooker the volume remains constant. So the pressure will increase and after some time when the pressure becomes very high, the relief valve opens and releases the pressure. This shows that temperature is proportional to pressure.

gay lussac law

Avogadro’s Law

Avogadro’s Law states that equal volumes of gases at the same temperature and pressure contain an equal number of molecules. This law helps explain the concept of molar volume and the relationship between volume and the number of moles of gas.

avagadro law

Ideal gas law

The ideal gas law is the equation of the state of an ideal gas that relates pressure, volume, the quantity of gas, and absolute temperature.


                              WHERE, P=pressure.


                                            n=number of moles of gas.

                                            R=ideal gas constant. (8.314 J/mol-k)

                                            T=absolute temperature

ideal gas law
Gas LawFormulaDescription
Charles’s LawV1/T1=V2/T2At constant P, as the volume increases the temperature also increases.
Boyle’s LawP1V1=P2V2At constant T, if pressure increases then volume decreases.
Gay- Lussac LawP1/T1=P2/T2At constant V as pressure increases the temperature also increases.
Avogadro’s LawV / n = constantWhen the amount of gas increases, the volume of the gas also increases at constant pressure and temperature
Ideal Gas LawPV=nRT  Ideal gas is those which has no force of attraction and no force of repulsion (i.e., Intermolecular forces between particle will be zero )


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