Step 1: Understand that the combined gas law relates pressure (P), volume (V), and temperature (T) of a gas.
Step 2: Know that P1, V1, and T1 represent the initial pressure, volume, and temperature of the gas.
Step 3: Know that P2, V2, and T2 represent the final pressure, volume, and temperature of the gas.
Step 4: The equation is written as P1V1/T1 = P2V2/T2.
Step 5: This equation combines three important gas laws: Boyle's law (pressure and volume), Charles's law (volume and temperature), and Gay-Lussac's law (pressure and temperature).
Step 6: Use this equation to solve problems involving changes in the state of a gas.
