表中水的密度为不含有空气的纯水在标准大气压（101.325kPa）下的密度值。
水的离子积常数 Kw = αH+·αOH-，且αH+ = αOH- 。
水在不同温度下的密度、粘度、介电常数和离子积常数 Kw 值
Densities, Viscosities, Dielectric Constants and Ionic Product Constants of Water at Different Temperatures
温度 t (Temperature) /0C 密度ρ(Density)/(g/ml) 黏度η (Viscosity) /(10-3Pa·s) 介电常数ε(Dielectric constant)/(F/m) 离子积常数(Ionic product constant) Kw
温度 密度 黏度 介电常数 离子积常数 0 0.99984 - 87.9 0.11×10-14 2 0.99994 - - - 4 0.99997 - - - 5 0.999965 1.5188 85.9 0.17×10-14 6 0.99994 - - - 8 0.99985 - - - 10 0.9997 1.3097 83.95 0.30×10-14 12 0.9995 - - - 14 0.99924 - - - 15 0.999099 1.1447 82.04 0.46×10-14 16 0.99894 - - 0.50×10-14 17 - - - 0.55×10-14 18 0.9986 - - 0.60×10-14 19 - - - 0.65×10-14 20 0.998203 1.0087 80.18 0.69×10-14 21 - - - 0.76×10-14 22 0.99777 - - 0.81×10-14 23 - - - 0.87×10-14
24 0.9973 - - 0.93×10-14 25 0.997044 0.8949 78.36 1.00×10-14 26 0.99678 - - 1.10×10-14 27 - - - 1.17×10-14 28 0.99623 - - 1.29×10-14 29 - - - 1.38×10-14 30 0.995646 0.8004 76.58 1.48×10-14 31 - - - 1.58×10-14 32 0.99503 - - 1.70×10-14 33 - - - 1.82×10-14 34 0.99437 - - 1.95×10-14 35 0.99403 0.7208 74.85 2.09×10-14 36 0.99369 - - 2.24×10-14 37 - - - 2.40×10-14 38 0.99297 - - 2.57×10-14 39 - - - 2.75×10-14 40 0.99222 - 73.15 2.95×10-14 42 0.99144 - - - 44 0.99063 - - - 45 - - 71.5 - 46 0.98979 - - - 48 0.98893 - - - 50 0.98804 - 69.88 5.5×10-14 52 0.98712 - - - 54 0.98618 - - - 55 - - 68.3 -
56 0.98521 - - - 58 0.98422 - - - 60 0.9832 - 66.76 9.55×10-14 62 0.98216 - - - 64 0.98109 - - - 65 - - 65.25 - 66 0.98001 - - - 68 0.9789 - - - 70 0.97777 - 63.78 15.8×10-14 72 0.97661 - - - 74 0.97544 - - - 75 - - 62.34 - 76 0.97424 - - - 78 0.97303 - - - 80 0.97179 - 60.93 25.1×10-14 82 0.97053 - - - 84 0.96926 - - - 85 - - 59.55 - 86 0.96796 - - - 88 0.96665 - - - 90 0.96531 - 58.2 38.0×10-14 92 0.96396 - - - 94 0.96259 - - - 95 - - 56.88 - 96 0.9612 - - - 98 0.95979 - - -
100 0.95836 - 55.58 55.0×10-14
温度(℃) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 差数 X10 5 0.9999919 0.9999902 0.9999883 0.9999842 0.9999842 0.9999819 0.9999795 0.9999769 0.9999741 0.9999712 1 6 0.9999681 0.9999649 0.9999616 0.9999581 0.9999544 0.9999506 0.9999467 0.9999426 0.9999384 0.9999340 1 7 0.9999295 0.9999248 0.9999200 0.9999150 0.9999099 0.9999046 0.9998992 0.9998936 0.9998879 0.9998821 2 8 0.9998762 0.9998701 0.9998638 0.9998574 0.9998509 0.9998442 0.9998374 0.9998305 0.9998234 0.9998162 3 9 0.9998088 0.9998013 0.9997936 0.9997859 0.9997780 0.9997699 0.9997617 0.9997534 0.9997450 0.9997364 5 10 0.9997277 0.9997189 0.9997099 0.9997008 0.9996915 0.9996820 0.9996724 0.9996627 0.9996529 0.9996428 6 11 0.9996328 0.9996225 0.9996121 0.9996017 0.9995911 0.9995803 0.9995694 0.9995585 0.9995473 0.9995361 2 12 0.9995247 0.9995132 0.9995016 0.9994898 0.9994780 0.9994660 0.9994538 0.9994415 0.9994291 0.9994166 0 13 0.9994040 0.9993913 0.9993784 0.9993655 0.9993524 0.9993391 0.9993258 0.9993123 0.9992987 0.9992850 1 14 0.9992712 0.9992572 0.9992432 0.9992290 0.9992147 0.9992003 0.9991858 0.9991711 0.9991564 0.9991415 1 15 0.9991265 0.9991113 0.9990961 0.9990608 0.9990653 0.9990497 0.9990340 0.9990182 0.9990023 0.9989862 2 16 0.9989701 0.9989538 0.9989374 0.9989209 0.9989043 0.9988876 0.9988707 0.9988538 0.9988367 0.9988175 6 17 0.9988022 0.9987849 0.9987673 0.9987497 0.9987319 0.9987141 0.9986961 0.9986781 0.9986599 0.9986416 9 18 0.9986232 0.9986046 0.9985861 0.9985673 0.9985485 0.9985295 0.9985105 0.9984913 0.9984720 0.9984326 14 19 0.9984331 0.9984136 0.9983938 0.9983740 0.9983541 0.9983341 0.9983140 0.9982937 0.9982733 0.9982529 18 20 0.9982323 0.9982117 0.9981909 0.9981701 0.9981490 0.9981280 0.9981068 0.9981695 0.9980641 0.9980426 22 21 0.9980210 0.9979993 0.9979775 0.9979556 0.9979335 0.9979114 0.9978892 0.9978869 0.9978444 0.9973219 25 22 0.9977993 0.9977765 0.9977537 0.9977308 0.9977077 0.9976846 0.9976613 0.9976380 0.9976145 0.9975918 27
23 0.9975674 0.9975437 0.9975198 0.9974959 0.9974718 0.9974477 0.9974435 0.9973991 0.9973717 0.9973502 29 24 0.9973256 0.9973009 0.9972760 0.9972511 0.9972261 0.9972010 0.9971758 0.9971505 0.9971250 0.9970995 30 25 0.9970739 0.9970432 0.9970225 0.9969966 0.9969706 0.9969445 0.9969184 0.9968921 0.9963657 0.9968393 31 26 0.9968128 0.9967861 0.9967594 0.9967326 0.9967057 0.9966726 0.9966515 0.9966243 0.9965970 0.9965696 30 27 0.9965241 0.9965146 0.9964869 0.9964591 0.9964313 0.9964033 0.9963753 0.9963472 0.9963190 0.9962907 29 28 0.9962623 0.9962338 0.9962052 0.9961766 0.9961478 0.9961190 0.9961901 0.9960610 0.9960319 0.9960027 28 29 0.9959735 0.9959440 0.9959146 0.9958850 0.9958554 0.9950257 0.9957958 0.9957659 0.9957359 0.9957059 25 30 0.9956756 0.9956454 0.9956151 0.9955846 0.9955541 0.9955235 0.9954928 0.9954620 0.9954312 0.9954002 23 31 0.9953692 0.9953380 0.9953068 0.9952755 0.9952442 0.9952127 0.9951812 0.9951495 0.9951178 0.9950861 20 32 0.9950542 0.9950222 0.9949901 0.9949580 0.9959258 0.9948935 0.9948612 0.9948286 0.9947961 0.9947635 19 33 0.9947308 0.9946980 0.9946651 0.9946321 0.9945991 0.9945660 0.9945328 0.9944995 0.9944661 0.9944327 17 34 0.9943991 0.9943655 0.9943319 0.9942981 0.9942643 0.9942303 0.9941963 0.9941622 0.9941280 0.9940938 16 35 0.9940594 0.9940251 0.9949906 0.9949560 0.9949214 0.9948867 0.9948518 0.9948170 0.9947820 0.9947470 16