... The association of ethyl alcohol is confined to the liquid state; in the vapor state it is monomeric. ... critical pressure, kPab, 6383.48. critical volume, L/mol, 0.167. critical compressibility factor, z, in, 0.248. ... heat of fusion, J/gc, 104.6. flammable limits in air, vol %, lower, 4.3. upper, 19.0. ...