What is the combined gas law equation

\frac  {P_{1}V_{1}}{T_{1}}=\frac  {P_{2}V_{2}}{T_{2}}

Explanation:

Gay-Lussac's law states that at constant volume, the pressure of a gas is directly proportional to the absolute temperature, P ∝ T at constant V. These three gas laws can be combined into a so-called combined gas law, P 1 V 1 T 1 = P 2 V 2 T 2.

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