The three laws of ideal gases i.e., Boyle’s Law, Charles’s Law, and Gay-Lussac’s Law are collectively known as the combined gas law. The combined gas law uses the three laws and states that the ratio of the product of the P, V, and T is equal to a constant value.
This law becomes the ideal gas law when Avogadro’s law is added to it. This law works only when all the conditions remain constant but pressure, volume, and temperature.
The combined gas law is written as
PV/T = k or
P1V1/T1 = P2V2/T2
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