Relationship between temperature and volume at constant pressure 



Note how at 273^{o}C
the volume of a gas theoretically becomes zero. This is called the absolute
zero and gives rise to a new temperature scale called the absolute
temperature scale. This new temperature scale is given the symbol
K and is called the Kelvin, after Lord Kelvin who first suggested
it. At absolute zero the gas molecules have no kinetic energy To convert from Celsius to Kelvin we simply add 273 to the Celsius value. Celsius + 273 = Kelvin Click to try some exercises in converting Celsius to Kelvin. 

As seen in the animation
above, at constant pressure, the volume of a fixed mass of gas is directly
proportional to the absolute temperature . The formula on the right represents
the relationship. This is known as Charle's Law after the
famous French scientist, Jacques Charles. In this expression K is a constant, V is volume in litres and T is temperature in degrees Kelvin. 
