The graph of Charles Law
is a graph describing how the volume of a gas changes with respect to
its temperature and where the volume is a linear function of the
temperature. When the temperature of gas is given in units of
Kelvin, the graph intersects the x-axis at 0 K, where the volume is 0.
On the other hand, if the temperature is given in units of Celsius, the
graph intersects -273 degrees Celsius on the x-axis.