Temperature1 Density 0 999.8395 4 999.9720 (density maximum) 10 999.7026 15 999.1026 20 998.2071 22 997.7735 25 997.0479 30 995.6502 40 992.2 60 983.2 80 971.8 100 958.4 Temperature Vapor Pressure (torr) Vapor Pressure (Pa) 0 4.6 613.2812 4 6.1 813.2642 10 9.2 1226.5620 15 12.8 1706.5220 20 17.5 2333.1350 22 19.8 2639.7760 25 23.8 3173.0640 30 31.8 4239.6400 35 42.2 5626.1880 40 55.3 7372.7070 45 71.9 9585.8520 50 92.5 12332.2900 55 118.0 15732.0000 60 149.4 19918.3100 65 187.5 24997.8800 70 233.7 31157.3500 75 289.1 38543.3900 80 355.1 47342.6400 85 433.6 57808.4200 90 525.8 70100.7100 95 633.9 84512.8200 100 760.0 101324.7000 Temperature Kw 10–14 pKw2 0 0.112 14.95 5 0.182 14.74 10 0.288 14.54 15 0.465 14.33 20 0.671 14.17 25 0.991 14.00 30 1.432 13.84 35 2.042 13.69 40 2.851 13.55 45 3.917 13.41 50 5.297 13.28 55 7.080 13.15 60 9.311 13.03 75 19.950 12.70 100 56.230 12.25 Specific Heat Capacity for Water C°(H2O(l)) = 4184 J∙K−1∙kg−1 = 4.184 J∙g-1∙°C-1 C°(H2O(s)) = 1864 J∙K−1∙kg−1 C°(H2O(g)) = 2093 J∙K−1∙kg−1 Standard Water Melting and Boiling Temperatures and Enthalpies of the Transitions Unnamed: 0_level_1 Temperature (K) ΔH (kJ/mol) melting 273.15 6.088 boiling 373.15 40.656 (44.016 at 298 K) Water Cryoscopic (Freezing Point Depression) and Ebullioscopic (Boiling Point Elevation) Constants Kf = 1.86°C∙kg∙mol−1 (cryoscopic constant) Kb = 0.51°C∙kg∙mol−1 (ebullioscopic constant) <figure class="ui-has-child-figcaption" > Water full-range spectral absorption curve. This curve shows the full-range spectral absorption for water. The y-axis signifies the absorption in 1/cm. If we divide 1 by this value, we will obtain the length of the path (in cm) after which the intensity of a light beam passing through water decays by a factor of the base of the natural logarithm e (e = 2.718281828). Footnotes 1 Data for t < 0 °C are for supercooled water 2 pK w = –log 10 (K w )