Abstract
The molar enthalpy of solution of gaseous m-xylene in polystyrene near the glass transition point was determined through the thermodynamic relation between Henry's constant and the molar enthalpy of solution. In the relation between Henry's constant and temperature, a peak was clearly represented at the glass transition temperature, tg. Further it has been found that the molar enthalpy of solution changes sharply near tg and it becomes almost zero at tg.
