Charles Law establishes that a gas's volume is directly proportional to its temperature when measured in Kelvin. An experiment demonstrated that as a gas is heated, its volume increases, and as it cools, the volume decreases, conforming to the relationship V1/T1 = V2/T2. The mathematical model, along with an example converting temperatures and calculating volume changes, illustrates that even a modest temperature increase results in a predictable expansion, while absolute zero theoretically implies zero volume.