are constants that can be experimentally determined. Equation(7) has an interesting and amazing implication. Since negative pressure is impossble,the temlperature Taz at which P=0 is the lowest attainable temperature or the absolutr zero.Although extrapolation of the ideal gas equation implies the existence of a unique value of absolute zero, this temperature has never been reached in practice. The reason is that all gases liquefy before reaching absolute zero, and deviate from ideal behavior as the temperature becomes too low or the pressure too high.