The absolute temperature scale
In thermal physics temperature is measured using the absolute temperature scale. The units of this scale is the kelvin (K).
There is the lowest possible temperature that any object can have called 'absolute zero' at -273(.15) degrees Celsius.
Absolute zero is given a value of zero kelvins (0 K) on the absolute temperature scale.
K = C + 273(.15)
The three gas laws - Boyle's law
Boyle's law: At a constant temperature and a fixed mass the pressure p and volume V of a gas are inversely proportional.
p x V = constant
The higher the temperature of the gas, the further the curve is from the origin.