Combined and ideal gas law | General gas equation
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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