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Sunday, 29 March 2020

Facts about Behaviour of Gases

Facts about Behaviour of Gases

All gases containing equal amount of substances occupy the same volume at the same temperature and pressure

Gas Laws

Boyle's Law: The pressure of a fixed amount of a gas varies inversely with the volume if the temperature is maintained constant.

Charle's Law: The volume of a fixed amount of a gas varies directly with its absolute temperature at constant pressure.

Gay-Lussac's Law: At constant volume, the pressure of given mass of gas is directly proportional to the temperature in Kelvin.

Avogadro Law: It states that at a given temperature and pressure the volume of a gas is directly proportional to the amount of gas.

Ideal Gas Equation
Boyles law, V T (n, t constant) ------------- (1)

Charles law, V T (n, P constant) ------------- (2)

Avogadro's law, V T (P, T constant) ------------- (3)

Combining the three 

V 1/P x T x n
or V = a constant x nT/P

This constant is known as universal gas constant and is denoted as 'R'

Then, V – R x n x T/P

PV= n x R x T
i.e. PV = nRT

This equation is called Ideal gas equation.

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