Pure substances and Steam tables and ideal and real gases

Properties Of Gases
¾ In thermodynamics we distinguish between
a) perfect gases
b)Ideal gases
c) real gases
¾ The equation pV/T= constant was derived assuming that /T= constant
Molecules of a gas are point masses
¾ There are no attractive nor repulsive forces between the
molecules
¾ Perfect gas is one which obeys the above equation