Lesson 6

Sorry Charlie

Charles' Law

Volume is proportional to the temperature, T, in the Kelvin scale

Formula:

k is the proportional constant that indicates how much the volume of gas changes per degree of Kelvin.

This means that you can find a change in volume that comes with a change in temperature

ex: a balloon contains 300 mL of air at 285 degrees Kelvin so at 300 degrees, what will be the volume? To find this we first need to find the constant k. Using the formula, take the volume 300 divided by temperature 285 to get about 1.05 so k=1.05 mL/K. Next we have to figure out the volume of the ballon at 300 degrees. Now using the formula, multiply the constant 1.05 by the temperature 300 to equal 315. The answer is V=315 mL.

Since we learned that when gas is heated up the particles inside move fast and gain more momentum causing expansion, this results in a change of volume. The volume increases meaning the density decreases, which is why hot air rises.

Practice Problems

2. If you have the proportionality constant k then you can multiply it by the temperature to find the volume.
5. 261 degrees Kelvin

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