Graphical Explanation Charles Law

We plot a graph between temperature on x axis and volume of one mole of an ideal gas on y axis. We get a straight line which cuts the temperature axix at _273.16C°. This can be possible only if we extrapolate the graph upto _273.16C°.
 If the substance remain in the gaseous state then we achieve this lowest temperature
. Above this temperature all gases are converted into liquid . If we taken the temoerature on kelvin scale then temperature obey charles laws. 

For example

At 373 k( 100 c°) the volume is,746cm^3 according to charles, law v1/t1= v2/t2= k 566/283= 746/373 = 2= k 

Greater the mass of gases taken, greater will be the slope of straight line. The reason is the greater the number of moles greater the volume occupied. All these straight lines when extrapolated meet at a single point of -273.16 c° ( 0 kelvin). It is apparent that this temperature of -273.16 c° will be attained when the volume becomes zero. But for a real gas the zero volume is impossile which shows that this temperature can not be attained for a real gas. This is how we recognize that -273.16 c° must represent the coldest temperature.