Well to sum it up, describes how gases tend to expand when heated. Let's go to the library and read more about it.
This book says that Charles's law can be represented by V/T=k
So the variables that change are volume and temperature.
Did you guys know that the law was published by Joseph Gay-Lussac in 1802? His work originated from an experiment with balloons. He discovered that the volume of gas is directly proportional to its temperature.
So it's like when you take a soccer ball outside, it deflates faster but if you leave it inside, it will stay inflated longer.