Question

What do you mean by critical temperature?how the value of critical temperature is related with the value of gas constant "a"?

Answer 1

Critical temperature : the temperature of a substance in its critical state : the highest temperature at which it is possible to separate substances into two fluid phases (vapor and liquid)

Critical temp. T = 8a/(27Rb)

where; a,b = Van Der Waals constant , R= Universal Gas Constant