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　　常用液体介质为纯水。纯水在不同温度下的密度ρ0采用最新版本的国际温标纯水密度（表1为1990年国际温标纯水密度）。

表11990年国际温标纯水密度表

T90/℃
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

29
30
31
32
33
34
35
36
37
38
39
40

0.0
0.999840
0.999898
0.999940
0.999964
0.999972
0.999964
0.999940
0.999901
0.999848
0.999781
0.999699
0.999605
0.999497
0.999377
0.999244
0.999099
0.998943
0.998774
0.998595
0.998404
0.998203
0.997991
0.997769
0.997537
0.997295
0.997043
0.996782
0.996511
0.996231
0.995943
0.995645
0.995339
0.995024
0.994700
0.994369
0.994029
0.993681
0.993325
0.992962
0.992591
0.992212

0.1
0.999846
0.999904
0.999943
0.999966
0.999972
0.999962
0.999937
0.999897
0.999842
0.999773
0.999691
0.999595
0.999486
0.999364
0.999230
0.999084
0.998926
0.998757
0.998576
0.998385
0.998182
0.997970
0.997747
0.997513
0.997270
0.997018
0.996755
0.996484
0.996203
0.995913
0.995615
0.995307
0.994992
0.994667
0.994335
0.993994
0.993646
0.993289
0.992925
0.992553
?

0.2
0.999853
0.999908
0.999946
0.999967
0.999972
0.999960
0.999934
0.999892
0.999836
0.999765
0.999682
0.999584
0.999474
0.999351
0.999216
0.999069
0.998910
0.998739
0.998557
0.998365
0.998162
0.997948
0.997724
0.997490
0.997246
0.996992
0.996729
0.996456
0.996174
0.995884
0.995584
0.995276
0.994960
0.994635
0.994301
0.993960
0.993610
0.993253
0.992888
0.992516
?

0.3
0.999859
0.999913
0.999949
0.999968
0.999971
0.999958
0.999930
0.999887
0.999829
0.999758
0.999672
0.999574
0.999462
0.999338
0.999202
0.999053
0.998893
0.998722
0.998539
0.998345
0.998141
0.997926
0.997701
0.997466
0.997221
0.996966
0.996702
0.996428
0.996146
0.995854
0.995554
0.995245
0.994927
0.994602
0.994267
0.993925
0.993575
0.993217
0.992851
0.992478
?

0.4
0.999865
0.999917
0.999952
0.999969
0.999971
0.999956
0.999926
0.999882
0.999823
0.999750
0.999663
0.999563
0.999450
0.999325
0.999187
0.999038
0.998876
0.998704
0.998520
0.998325
0.998120
0.997904
0.997678
0.997442
0.997195
0.996940
0.996675
0.996401
0.996117
0.995825
0.995523
0.995214
0.994895
0.994569
0.994234
0.993891
0.993540
0.993181
0.992814
0.992440
?

0.5
0.99871
0.999921
0.999954
0.999970
0.999970
0.999954
0.999923
0.999877
0.999816
0.999742
0.999654
0.999553
0.999439
0.999312
0.999173
0.999022
0.998860
0.998686
0.998501
0.998305
0.998099
0.997882
0.997655
0.997417
0.997170
0.996914
0.996648
0.996373
0.996088
0.995795
0.995493
0.995182
0.994863
0.994535
0.994200
0.993856
0.993504
0.993144
0.992777
0.992402
?

0.6
0.999877
0.999925
0.999956
0.999971
0.999969
0.999951
0.999919
0.999871
0.999809
0.999734
0.999644
0.999542
0.999426
0.999299
0.999158
0.999006
0.998843
0.998668
0.998482
0.998285
0.998077
0.997859
0.997631
0.997393
0.997145
0.996888
0.996621
0.996344
0.996059
0.995765
0.995462
0.995151
0.994831
0.994502
0.994166
0.993821
0.993469
0.993108
0.992740
0.992364
?

0.7
0.999883
0.999929
0.999959
0.999971
0.999968
0.999949
0.999915
0.999866
0.999802
0.999725
0.999634
0.999531
0.999414
0.999285
0.999144
0.998991
0.998826
0.998650
0.998463
0.998265
0.998056
0.997873
0.997608
0.997369
0.997120
0.996861
0.996594
0.996316
0.996030
0.995735
0.995431
0.995119
0.994798
0.994469
0.994132
0.993786
0.993433
0.993072
0.992703
0.992326
?

0.8
0.999888
0.999933
0.999961
0.999972
0.999967
0.999946
0.999910
0.999860
0.999795
0.999717
0.999625
0.999520
0.999402
0.999271
0.999129
0.998975
0.998809
0.998632
0.998443
0.998244
0.998035
0.997815
0.997584
0.997344
0.997094
0.996835
0.996566
0.996288
0.996001
0.995705
0.995401
0.995087
0.994766
0.994436
0.994098
0.993751
0.993397
0.993035
0.992665
0.992288
?

0.9
0.999893
0.999937
0.999962
0.999972
0.999965
0.999943
0.999906
0.999854
0.999788
0.999708
0.999615
0.999508
0.999389
0.999258
0.999114
0.998959
0.998792
0.998613
0.998424
0.998224
0.998013
0.997792
0.997561
0.997320
0.997069
0.996809
0.996539
0.996260
0.995972
0.995675
0.995370
0.995055
0.994733
0.994402
0.994063
0.993716
0.993361
0.992999
0.992628
0.992250
?

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