Combined and ideal gas law | General gas equation

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The combined gas law or general gas laws give us the relation between the two variables when the third variable is constant. This law is obtained by Laws of a perfect gas. Boyle's and Charles's law are combined together, which gives us a general gas equation. It shows the relationship between pressure, temperature, and volume for a fixed mass of gas.

PV = KT 

By the above formula, 

P1 × V1 / T1 = P2 × V2 / T2

With the addition of the Avogadro's law, the combined gas law develops into the ideal gas law which is explained below. 

PV = nRT

Where, P = Pressure
V = Volume
n = number of moles
T = Temperature

Where R = Universal gas constant = 8.314 kPa L / mol K 

An equivalent formula for this gas law is following below. 

PV = kNT

Where, k = Boltzmann constant (1.381×10−23 J·K−1 in SI units)

These all equations which we explained above are exact only for an ideal gas, which neglects various intermolecular effects. 

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