Section 1 - National Measurement (Recognized-Value Standard of Measurement of the Density of Water) Determination 2026 - National Measurement (Recognized-Value Standard of Measurement of the Density of Water) Determination 2026

1National Measurement (Recognized-Value Standard of Measurement of the Density of Water) Determination 2026

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Commonwealth Coat of Arms of Australia

National Measurement (Recognized-Value Standard of Measurement of the Density of Water) Determination 2026

I, Dr Victoria Anne Coleman, Chief Metrologist, National Measurement Institute, make the following determination.

Dated 9 March 2026

Dr Victoria Anne Coleman

Chief Metrologist

Contents

1 Name

2 Commencement

3 Authority

4 Schedules

5 Definitions

6 Recognized-Value Standard of Measurement of the Density of Water

Schedule 1— The Density of Water in Kilograms per Cubic Metre as a Function of Temperature in Degrees Celsius

Schedule 2—Repeals

1 Name

This instrument is the National Measurement (Recognized-Value Standard of Measurement of the Density of Water) Determination 2026.

2 Commencement

(1) Each provision of this instrument specified in column 1 of the table commences, or is taken to have commenced, in accordance with column 2 of the table. Any other statement in column 2 has effect according to its terms.

Commencement information
Column 1 Column 2 Column 3
Provisions Commencement Date/Details
The whole of this instrument The day after this instrument is registered.

Note: This table relates only to the provisions of this instrument as originally made. It will not be amended to deal with any later amendments of this instrument.

(2) Any information in column 3 of the table is not part of this instrument. Information may be inserted in this column, or information in it may be edited, in any published version of this instrument.

3 Authority

This instrument is made under paragraphs 8A(1)(a) and (b) of the National Measurement Act 1960.

4 Schedules

Each instrument that is specified in a Schedule to this instrument is amended or repealed as set out in the applicable items in the Schedule concerned, and any other item in a Schedule to this instrument has effect according to its terms.

Temperature (°C)	Density (kg.m-3)	Temperature (°C)	Density (kg.m-3)	Temperature (°C)	Density (kg.m-3)	Temperature (°C)	Density (kg.m-3)
0.0	999.839	10.0	999.700	20.0	998.204	30.0	995.647
0.1	999.846	10.1	999.691	20.1	998.183	30.1	995.617
0.2	999.853	10.2	999.682	20.2	998.163	30.2	995.587
0.3	999.859	10.3	999.673	20.3	998.142	30.3	995.556
0.4	999.865	10.4	999.663	20.4	998.121	30.4	995.526
0.5	999.871	10.5	999.654	20.5	998.100	30.5	995.495
0.6	999.877	10.6	999.645	20.6	998.078	30.6	995.465
0.7	999.883	10.7	999.635	20.7	998.057	30.7	995.434
0.8	999.888	10.8	999.625	20.8	998.036	30.8	995.403
0.9	999.893	10.9	999.615	20.9	998.014	30.9	995.372
1.0	999.898	11.0	999.605	21.0	997.992	31.0	995.341
1.1	999.903	11.1	999.595	21.1	997.971	31.1	995.310
1.2	999.908	11.2	999.585	21.2	997.949	31.2	995.279
1.3	999.913	11.3	999.574	21.3	997.927	31.3	995.248
1.4	999.917	11.4	999.564	21.4	997.905	31.4	995.216
1.5	999.921	11.5	999.553	21.5	997.883	31.5	995.185
1.6	999.925	11.6	999.542	21.6	997.860	31.6	995.153
1.7	999.929	11.7	999.531	21.7	997.838	31.7	995.122
1.8	999.933	11.8	999.520	21.8	997.816	31.8	995.090
1.9	999.936	11.9	999.509	21.9	997.793	31.9	995.058
2.0	999.940	12.0	999.497	22.0	997.770	32.0	995.026
2.1	999.943	12.1	999.486	22.1	997.748	32.1	994.995
2.2	999.946	12.2	999.474	22.2	997.725	32.2	994.962
2.3	999.949	12.3	999.463	22.3	997.702	32.3	994.930
2.4	999.952	12.4	999.451	22.4	997.679	32.4	994.898
2.5	999.954	12.5	999.439	22.5	997.656	32.5	994.866
2.6	999.956	12.6	999.427	22.6	997.632	32.6	994.834
2.7	999.959	12.7	999.415	22.7	997.609	32.7	994.801
2.8	999.961	12.8	999.402	22.8	997.586	32.8	994.769
2.9	999.962	12.9	999.390	22.9	997.562	32.9	994.736
3.0	999.964	13.0	999.377	23.0	997.538	33.0	994.703
3.1	999.966	13.1	999.364	23.1	997.515	33.1	994.670
3.2	999.967	13.2	999.352	23.2	997.491	33.2	994.638
3.3	999.968	13.3	999.339	23.3	997.467	33.3	994.605
3.4	999.969	13.4	999.326	23.4	997.443	33.4	994.572
3.5	999.970	13.5	999.312	23.5	997.419	33.5	994.539
3.6	999.971	13.6	999.299	23.6	997.394	33.6	994.505
3.7	999.971	13.7	999.286	23.7	997.370	33.7	994.472
3.8	999.972	13.8	999.272	23.8	997.346	33.8	994.439
3.9	999.972	13.9	999.258	23.9	997.321	33.9	994.405
4.0	999.972	14.0	999.244	24.0	997.297	34.0	994.372
4.1	999.972	14.1	999.230	24.1	997.272	34.1	994.338
4.2	999.972	14.2	999.216	24.2	997.247	34.2	994.304
4.3	999.971	14.3	999.202	24.3	997.222	34.3	994.271
4.4	999.971	14.4	999.188	24.4	997.197	34.4	994.237
4.5	999.970	14.5	999.173	24.5	997.172	34.5	994.203
4.6	999.969	14.6	999.159	24.6	997.147	34.6	994.169
4.7	999.968	14.7	999.144	24.7	997.121	34.7	994.135
4.8	999.967	14.8	999.130	24.8	997.096	34.8	994.101
4.9	999.965	14.9	999.115	24.9	997.071	34.9	994.066
5.0	999.964	15.0	999.100	25.0	997.045	35.0	994.032
5.1	999.962	15.1	999.084	25.1	997.019	35.1	993.998
5.2	999.960	15.2	999.069	25.2	996.993	35.2	993.963
5.3	999.958	15.3	999.054	25.3	996.968	35.3	993.929
5.4	999.956	15.4	999.038	25.4	996.942	35.4	993.894
5.5	999.954	15.5	999.023	25.5	996.916	35.5	993.859
5.6	999.952	15.6	999.007	25.6	996.889	35.6	993.824
5.7	999.949	15.7	998.991	25.7	996.863	35.7	993.790
5.8	999.946	15.8	998.975	25.8	996.837	35.8	993.755
5.9	999.943	15.9	998.959	25.9	996.810	35.9	993.719
6.0	999.940	16.0	998.943	26.0	996.784	36.0	993.684
6.1	999.937	16.1	998.927	26.1	996.757	36.1	993.649
6.2	999.934	16.2	998.910	26.2	996.730	36.2	993.614
6.3	999.930	16.3	998.894	26.3	996.704	36.3	993.578
6.4	999.927	16.4	998.877	26.4	996.677	36.4	993.543
6.5	999.923	16.5	998.860	26.5	996.650	36.5	993.508
6.6	999.919	16.6	998.843	26.6	996.623	36.6	993.472
6.7	999.915	16.7	998.827	26.7	996.595	36.7	993.436
6.8	999.910	16.8	998.809	26.8	996.568	36.8	993.400
6.9	999.906	16.9	998.792	26.9	996.541	36.9	993.365
7.0	999.902	17.0	998.775	27.0	996.513	37.0	993.329
7.1	999.897	17.1	998.757	27.1	996.486	37.1	993.293
7.2	999.892	17.2	998.740	27.2	996.458	37.2	993.257
7.3	999.887	17.3	998.722	27.3	996.430	37.3	993.221
7.4	999.882	17.4	998.704	27.4	996.403	37.4	993.184
7.5	999.877	17.5	998.687	27.5	996.375	37.5	993.148
7.6	999.871	17.6	998.669	27.6	996.347	37.6	993.112
7.7	999.866	17.7	998.650	27.7	996.318	37.7	993.075
7.8	999.860	17.8	998.632	27.8	996.290	37.8	993.039
7.9	999.854	17.9	998.614	27.9	996.262	37.9	993.002
8.0	999.848	18.0	998.596	28.0	996.234	38.0	992.965
8.1	999.842	18.1	998.577	28.1	996.205	38.1	992.929
8.2	999.836	18.2	998.558	28.2	996.177	38.2	992.892
8.3	999.830	18.3	998.540	28.3	996.148	38.3	992.855
8.4	999.823	18.4	998.521	28.4	996.119	38.4	992.818
8.5	999.816	18.5	998.502	28.5	996.090	38.5	992.781
8.6	999.810	18.6	998.483	28.6	996.062	38.6	992.743
8.7	999.803	18.7	998.463	28.7	996.033	38.7	992.706
8.8	999.795	18.8	998.444	28.8	996.003	38.8	992.669
8.9	999.788	18.9	998.425	28.9	995.974	38.9	992.632
9.0	999.781	19.0	998.405	29.0	995.945	39.0	992.594
9.1	999.773	19.1	998.386	29.1	995.916	39.1	992.557
9.2	999.766	19.2	998.366	29.2	995.886	39.2	992.519
9.3	999.758	19.3	998.346	29.3	995.857	39.3	992.481
9.4	999.750	19.4	998.326	29.4	995.827	39.4	992.444
9.5	999.742	19.5	998.306	29.5	995.797	39.5	992.406
9.6	999.734	19.6	998.286	29.6	995.768	39.6	992.368
9.7	999.725	19.7	998.266	29.7	995.738	39.7	992.330
9.8	999.717	19.8	998.245	29.8	995.708	39.8	992.292
9.9	999.708	19.9	998.225	29.9	995.678	39.9	992.254
10.0	999.700	20.0	998.204	30.0	995.647	40.0	992.215

Temperature (°C)

Density (kg.m-3)

Temperature (°C)

Density (kg.m-3)

Temperature (°C)

Density (kg.m-3)

Temperature (°C)

Density (kg.m-3)

0.0

999.839

10.0

999.700

20.0

998.204

30.0

995.647

0.1

999.846

10.1

999.691

20.1

998.183

30.1

995.617

0.2

999.853

10.2

999.682

20.2

998.163

30.2

995.587

0.3

999.859

10.3

999.673

20.3

998.142

30.3

995.556

0.4

999.865

10.4

999.663

20.4

998.121

30.4

995.526

0.5

999.871

10.5

999.654

20.5

998.100

30.5

995.495

0.6

999.877

10.6

999.645

20.6

998.078

30.6

995.465

0.7

999.883

10.7

999.635

20.7

998.057

30.7

995.434

0.8

999.888

10.8

999.625

20.8

998.036

30.8

995.403

0.9

999.893

10.9

999.615

20.9

998.014

30.9

995.372

1.0

999.898

11.0

999.605

21.0

997.992

31.0

995.341

1.1

999.903

11.1

999.595

21.1

997.971

31.1

995.310

1.2

999.908

11.2

999.585

21.2

997.949

31.2

995.279

1.3

999.913

11.3

999.574

21.3

997.927

31.3

995.248

1.4

999.917

11.4

999.564

21.4

997.905

31.4

995.216

1.5

999.921

11.5

999.553

21.5

997.883

31.5

995.185

1.6

999.925

11.6

999.542

21.6

997.860

31.6

995.153

1.7

999.929

11.7

999.531

21.7

997.838

31.7

995.122

1.8

999.933

11.8

999.520

21.8

997.816

31.8

995.090

1.9

999.936

11.9

999.509

21.9

997.793

31.9

995.058

2.0

999.940

12.0

999.497

22.0

997.770

32.0

995.026

2.1

999.943

12.1

999.486

22.1

997.748

32.1

994.995

2.2

999.946

12.2

999.474

22.2

997.725

32.2

994.962

2.3

999.949

12.3

999.463

22.3

997.702

32.3

994.930

2.4

999.952

12.4

999.451

22.4

997.679

32.4

994.898

2.5

999.954

12.5

999.439

22.5

997.656

32.5

994.866

2.6

999.956

12.6

999.427

22.6

997.632

32.6

994.834

2.7

999.959

12.7

999.415

22.7

997.609

32.7

994.801

2.8

999.961

12.8

999.402

22.8

997.586

32.8

994.769

2.9

999.962

12.9

999.390

22.9

997.562

32.9

994.736

3.0

999.964

13.0

999.377

23.0

997.538

33.0

994.703

3.1

999.966

13.1

999.364

23.1

997.515

33.1

994.670

3.2

999.967

13.2

999.352

23.2

997.491

33.2

994.638

3.3

999.968

13.3

999.339

23.3

997.467

33.3

994.605

3.4

999.969

13.4

999.326

23.4

997.443

33.4

994.572

3.5

999.970

13.5

999.312

23.5

997.419

33.5

994.539

3.6

999.971

13.6

999.299

23.6

997.394

33.6

994.505

3.7

999.971

13.7

999.286

23.7

997.370

33.7

994.472

3.8

999.972

13.8

999.272

23.8

997.346

33.8

994.439

3.9

999.972

13.9

999.258

23.9

997.321

33.9

994.405

4.0

999.972

14.0

999.244

24.0

997.297

34.0

994.372

4.1

999.972

14.1

999.230

24.1

997.272

34.1

994.338

4.2

999.972

14.2

999.216

24.2

997.247

34.2

994.304

4.3

999.971

14.3

999.202

24.3

997.222

34.3

994.271

4.4

999.971

14.4

999.188

24.4

997.197

34.4

994.237

4.5

999.970

14.5

999.173

24.5

997.172

34.5

994.203

4.6

999.969

14.6

999.159

24.6

997.147

34.6

994.169

4.7

999.968

14.7

999.144

24.7

997.121

34.7

994.135

4.8

999.967

14.8

999.130

24.8

997.096

34.8

994.101

4.9

999.965

14.9

999.115

24.9

997.071

34.9

994.066

5.0

999.964

15.0

999.100

25.0

997.045

35.0

994.032

5.1

999.962

15.1

999.084

25.1

997.019

35.1

993.998

5.2

999.960

15.2

999.069

25.2

996.993

35.2

993.963

5.3

999.958

15.3

999.054

25.3

996.968

35.3

993.929

5.4

999.956

15.4

999.038

25.4

996.942

35.4

993.894

5.5

999.954

15.5

999.023

25.5

996.916

35.5

993.859

5.6

999.952

15.6

999.007

25.6

996.889

35.6

993.824

5.7

999.949

15.7

998.991

25.7

996.863

35.7

993.790

5.8

999.946

15.8

998.975

25.8

996.837

35.8

993.755

5.9

999.943

15.9

998.959

25.9

996.810

35.9

993.719

6.0

999.940

16.0

998.943

26.0

996.784

36.0

993.684

6.1

999.937

16.1

998.927

26.1

996.757

36.1

993.649

6.2

999.934

16.2

998.910

26.2

996.730

36.2

993.614

6.3

999.930

16.3

998.894

26.3

996.704

36.3

993.578

6.4

999.927

16.4

998.877

26.4

996.677

36.4

993.543

6.5

999.923

16.5

998.860

26.5

996.650

36.5

993.508

6.6

999.919

16.6

998.843

26.6

996.623

36.6

993.472

6.7

999.915

16.7

998.827

26.7

996.595

36.7

993.436

6.8

999.910

16.8

998.809

26.8

996.568

36.8

993.400

6.9

999.906

16.9

998.792

26.9

996.541

36.9

993.365

7.0

999.902

17.0

998.775

27.0

996.513

37.0

993.329

7.1

999.897

17.1

998.757

27.1

996.486

37.1

993.293

7.2

999.892

17.2

998.740

27.2

996.458

37.2

993.257

7.3

999.887

17.3

998.722

27.3

996.430

37.3

993.221

7.4

999.882

17.4

998.704

27.4

996.403

37.4

993.184

7.5

999.877

17.5

998.687

27.5

996.375

37.5

993.148

7.6

999.871

17.6

998.669

27.6

996.347

37.6

993.112

7.7

999.866

17.7

998.650

27.7

996.318

37.7

993.075

7.8

999.860

17.8

998.632

27.8

996.290

37.8

993.039

7.9

999.854

17.9

998.614

27.9

996.262

37.9

993.002

8.0

999.848

18.0

998.596

28.0

996.234

38.0

992.965

8.1

999.842

18.1

998.577

28.1

996.205

38.1

992.929

8.2

999.836

18.2

998.558

28.2

996.177

38.2

992.892

8.3

999.830

18.3

998.540

28.3

996.148

38.3

992.855

8.4

999.823

18.4

998.521

28.4

996.119

38.4

992.818

8.5

999.816

18.5

998.502

28.5

996.090

38.5

992.781

8.6

999.810

18.6

998.483

28.6

996.062

38.6

992.743

8.7

999.803

18.7

998.463

28.7

996.033

38.7

992.706

8.8

999.795

18.8

998.444

28.8

996.003

38.8

992.669

8.9

999.788

18.9

998.425

28.9

995.974

38.9

992.632

9.0

999.781

19.0

998.405

29.0

995.945

39.0

992.594

9.1

999.773

19.1

998.386

29.1

995.916

39.1

992.557

9.2

999.766

19.2

998.366

29.2

995.886

39.2

992.519

9.3

999.758

19.3

998.346

29.3

995.857

39.3

992.481

9.4

999.750

19.4

998.326

29.4

995.827

39.4

992.444

9.5

999.742

19.5

998.306

29.5

995.797

39.5

992.406

9.6

999.734

19.6

998.286

29.6

995.768

39.6

992.368

9.7

999.725

19.7

998.266

29.7

995.738

39.7

992.330

9.8

999.717

19.8

998.245

29.8

995.708

39.8

992.292

9.9

999.708

19.9

998.225

29.9

995.678

39.9

992.254

10.0

999.700

20.0

998.204

30.0

995.647

40.0

992.215