Given the phase diagram of water below, what are the values of its critical temperature and critical pressure? Also, at 0 degrees C, what kind of phase changes would occur as the Plausible photomolecular effect leading to water evaporation exceeding the thermal limit PNAS thermodynamics Why is there any vapor above the water surface at atmospheric pressure and room temperature? Physics Stack Exchange For water at 100^(@)C and 1 bar, Delta_(vap) H Delta_(vap)U = _______ xx 10^(2) J mol^( 1). (R