In terms of Charles' law, explain why `-273^(@)C` is the lowest possible temperature?

Explanation

Charles' law states that at constant pressure, the volume of a fixed mass of gas is directly proportional to its absolute temperature.

It was found that for all gases (at any given pressure), the plots volume vs. temperature (in `""^(@)C`) is a straignt line. If this line is extended to zero volume, then it intersects the temperature-axis at `-273^(@)C.` In other words, the volume of any gas at `-273^(@)C` is zero. This is because all gases get liqufied before reaching a temperature of `-273^(@)C.` Hence, it can be concluded that `-273^(@)C` is the lowest possible temperature.