Lesson 13

Combined Gas Law

When all three variables of temperature, pressure, and volume are variables and none stay constant, you need to use the Combined Gas Law.

Formula

• k=(P)(V)/ T - the proportionality constant k equals the original pressure multiplied by the original volume all divided by the original temperature.
• After finding this proportionality constant, you can plug it into the equation along with the rest of your changed values to find either the new pressure, volume, or temperature.

Changing gas pressure has more of an effect on volume than results that may have come from changing the temperatures.

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