Primary Source Data · Pharmaceutical & Laboratory Reference

Isopropyl Alcohol–Water Mixture Density

International Critical Tables, Vol. 3 (1928), pp. 120–121 · Bearce, Mulligan & Maslin · C₃H₇OH, Isopropyl Alcohol

Primary source transcription. This table is transcribed directly from the International Critical Tables of Numerical Data, Physics, Chemistry and Technology, Volume III (1928), pages 120–121, published by McGraw-Hill for the National Research Council. Values are reproduced exactly as printed, including the original number of significant figures. The ICT is itself the primary source cited by Perry's Chemical Engineers' Handbook (6th Ed., 1984) for its isopropanol-water density data.

Density notation: d₄^t — standard physical chemistry notation for the density of a substance at temperature t (°C), expressed relative to water at 4 °C. Since water at 4 °C has a density of exactly 1.000000 g/mL by definition, d₄^t values are numerically equal to absolute density in g/mL. The subscript 4 refers to the reference temperature of water; the superscript t is the measurement temperature.

Compositions: Wt. % in vacuo — mass fraction (% w/w) of isopropanol, where weighings were made in vacuum (no buoyancy correction applied; this is the modern standard).

Two independent datasets at 15 °C. The table contains two separate sets of density measurements at 15 °C from different observers, cited separately in the ICT:

15 °C (a) — Turbaba (ICT ref 82). Data available at 0–30% and 62–100% w/w; no values at 31–61% w/w.
15 °C (b) — Doroshevskii (ICT ref 16). Complete data available at 0–100% w/w; no gaps.

The 0 °C and 30 °C columns are also from Turbaba (ref 82); the 20 °C column is from Lebo (ref 47). Perry's Chemical Engineers' Handbook (6th Ed.) reproduces both 15 °C datasets, labelling them 15 °C * and 15 °C ** respectively. The two sets agree to within ~0.001 g/mL across the range.

Density notation d₄ᵗ: Standard physical chemistry notation for density at temperature t (°C) relative to water at 4 °C. Since water at 4 °C has a density of exactly 1.000000 g/mL, these values are numerically equal to absolute density in g/mL.

5th decimal place in the 15 °C (b) column: All eleven values with a 5th decimal place appear exclusively in the Doroshevskii (ref 16) column, and exclusively at decade concentrations (0, 10, 20, … 100% w/w). This systematic pattern — one column, regular intervals — strongly suggests the 5th digit is a deliberate editorial convention indicating qualified precision: the original measurement was reported to 5 significant figures at those concentrations, but the smaller font signals that the last digit carries less certainty than the preceding four. This was common practice in 1920s scientific tables. The intermediate values (1–9%, 11–19%, etc.) are given to 4 decimal places only, consistent with interpolation or lower-precision measurement at those points. The 5th digit is reproduced here in a smaller raised style, matching the original.

Density Table · d₄^t g/mL

% w/w	0 °C	15 °C (a)	15 °C (b)	20 °C	30 °C
IPA	g/mL	g/mL	g/mL	g/mL	g/mL
0	0.9999	0.9991	0.99913	0.9982	0.9957
1	0.9980	0.9973	0.9972	0.9962	0.9939
2	0.9962	0.9956	0.9954	0.9944	0.9921
3	0.9946	0.9938	0.9936	0.9926	0.9904
4	0.9930	0.9922	0.9920	0.9909	0.9887
5	0.9916	0.9906	0.9904	0.9893	0.9871
6	0.9902	0.9892	0.9890	0.9877	0.9855
7	0.9890	0.9878	0.9875	0.9862	0.9839
8	0.9878	0.9864	0.9862	0.9847	0.9824
9	0.9866	0.9851	0.9849	0.9833	0.9809
10	0.9856	0.9838	0.98362	0.9820	0.9794
11	0.9846	0.9826	0.9824	0.9808	0.9778
12	0.9838	0.9813	0.9812	0.9797	0.9764
13	0.9829	0.9802	0.9800	0.9786	0.9750
14	0.9821	0.9790	0.9788	0.9776	0.9735
15	0.9814	0.9779	0.9777	0.9765	0.9720
16	0.9806	0.9768	0.9765	0.9754	0.9705
17	0.9799	0.9756	0.9753	0.9743	0.9690
18	0.9792	0.9745	0.9741	0.9731	0.9675
19	0.9784	0.9730	0.9728	0.9717	0.9658
20	0.9777	0.9719	0.97158	0.9703	0.9642
21	0.9768	0.9704	0.9703	0.9688	0.9624
22	0.9759	0.9690	0.9689	0.9669	0.9606
23	0.9749	0.9675	0.9674	0.9651	0.9587
24	0.9739	0.9660	0.9659	0.9634	0.9569
25	0.9727	0.9643	0.9642	0.9615	0.9549
26	0.9714	0.9626	0.9624	0.9597	0.9529
27	0.9699	0.9608	0.9605	0.9577	0.9509
28	0.9684	0.9590	0.9586	0.9558	0.9488
29	0.9669	0.9570	0.9568	0.9540	0.9467
30	0.9652	0.9551	0.95493	0.9520	0.9446
31	0.9634	—	0.9530	0.9500	0.9426
32	0.9615	—	0.9510	0.9481	0.9405
33	0.9596	—	0.9489	0.9460	0.9383
34	0.9577	—	0.9468	0.9440	0.9361
35	0.9557	—	0.9446	0.9419	0.9338
36	0.9536	—	0.9424	0.9399	0.9315
37	0.9514	—	0.9401	0.9377	0.9292
38	0.9493	—	0.9379	0.9355	0.9269
39	0.9472	—	0.9356	0.9333	0.9246
40	0.9450	—	0.93333	0.9310	0.9224
41	0.9428	—	0.9311	0.9287	0.9201
42	0.9406	—	0.9288	0.9264	0.9177
43	0.9384	—	0.9266	0.9239	0.9154
44	0.9361	—	0.9243	0.9215	0.9130
45	0.9338	—	0.9220	0.9191	0.9106
46	0.9315	—	0.9197	0.9165	0.9082
47	0.9292	—	0.9174	0.9141	0.9059
48	0.9270	—	0.9150	0.9117	0.9036
49	0.9247	—	0.9127	0.9093	0.9013
50	0.9224	—	0.91043	0.9069	0.8990
51	0.9201	—	0.9081	0.9044	0.8966
52	0.9178	—	0.9058	0.9020	0.8943
53	0.9155	—	0.9035	0.8996	0.8919
54	0.9132	—	0.9011	0.8971	0.8895
55	0.9109	—	0.8988	0.8946	0.8871
56	0.9086	—	0.8964	0.8921	0.8847
57	0.9063	—	0.8940	0.8896	0.8823
58	0.9040	—	0.8917	0.8874	0.8800
59	0.9017	—	0.8893	0.8850	0.8777
60	0.8994	—	0.8869	0.8825	0.8752
61	0.8970	—	0.8845	0.8800	0.8728
62	0.8947	0.8829	0.8821	0.8776	0.8704
63	0.8924	0.8805	0.8798	0.8751	0.8680
64	0.8901	0.8781	0.8775	0.8727	0.8656
65	0.8878	0.8757	0.8752	0.8702	0.8631
66	0.8854	0.8733	0.8728	0.8679	0.8607
67	0.8831	0.8710	0.8705	0.8656	0.8583
68	0.8807	0.8686	0.8682	0.8632	0.8559
69	0.8784	0.8662	0.8658	0.8609	0.8535
70	0.8761	0.8639	0.86346	0.8584	0.8511
71	0.8738	0.8615	0.8611	0.8560	0.8487
72	0.8714	0.8592	0.8588	0.8537	0.8464
73	0.8691	0.8568	0.8564	0.8513	0.8440
74	0.8668	0.8545	0.8541	0.8489	0.8416
75	0.8644	0.8521	0.8517	0.8464	0.8392
76	0.8621	0.8497	0.8493	0.8439	0.8368
77	0.8598	0.8474	0.8470	0.8415	0.8344
78	0.8575	0.8450	0.8446	0.8391	0.8321
79	0.8551	0.8426	0.8422	0.8366	0.8297
80	0.8528	0.8403	0.83979	0.8342	0.8273
81	0.8503	0.8379	0.8374	0.8317	0.8248
82	0.8479	0.8355	0.8350	0.8292	0.8224
83	0.8456	0.8331	0.8326	0.8268	0.8200
84	0.8432	0.8307	0.8302	0.8243	0.8175
85	0.8408	0.8282	0.8278	0.8219	0.8151
86	0.8384	0.8259	0.8254	0.8194	0.8127
87	0.8360	0.8234	0.8229	0.8169	0.8102
88	0.8336	0.8209	0.8205	0.8145	0.8078
89	0.8311	0.8184	0.8180	0.8120	0.8053
90	0.8287	0.8161	0.81553	0.8096	0.8029
91	0.8262	0.8136	0.8130	0.8072	0.8004
92	0.8237	0.8110	0.8104	0.8047	0.7979
93	0.8212	0.8085	0.8079	0.8023	0.7954
94	0.8186	0.8060	0.8052	0.7998	0.7929
95	0.8160	0.8034	0.8026	0.7973	0.7904
96	0.8133	0.8008	0.7999	0.7949	0.7878
97	0.8106	0.7981	0.7972	0.7925	0.7852
98	0.8078	0.7954	0.7945	0.7901	0.7826
99	0.8048	0.7926	0.7918	0.7877	0.7799
100	0.8016	0.7896	0.78913	0.7854	0.7770

Table — Isopropyl alcohol–water mixture density (d₄^t, g/mL) vs. IPA mass fraction (Wt. % in vacuo) at five temperatures. The two 15 °C columns are from independent observers (see note above). Em-dashes (—) indicate values not given in the original table. Small superscript digits in the 15 °C (b) column indicate a 5th decimal place of qualified precision (see note above). Source: ICT Vol. 3 (1928), pp. 120–121.

Sources & Provenance

[Primary] Bearce, H. W., Mulligan, Grace C., and Maslin, Merriel P. "Density of Certain Aqueous Organic Solutions." In: Washburn, E. W. (Ed.), International Critical Tables of Numerical Data, Physics, Chemistry and Technology, Vol. III, pp. 115–121. New York: McGraw-Hill for the National Research Council, 1928. Digital copy: Cornell University Library Digital Collections (chla2944761_2172).
[ref 82] Turbaba. Source of the 0 °C, 15 °C (a) (first dataset), and 30 °C columns.
[ref 16] Doroshevskii, A. G. Source of the 15 °C (b) (second dataset) column.
[ref 47] Independent observer (exact identity in ICT bibliography). Density data at 20 °C column.
[Secondary] Perry, R. H. and Green, D. W. (Eds.), Perry's Chemical Engineers' Handbook, 6th Ed. New York: McGraw-Hill, 1984, p. 3-92. Cites ICT Vol. 3 p. 120 as primary source for this data.

ICT Vol. 3 (1928) Isopropanol Density Table — Last updated: 6 April 2026 — Corrections: attributed gap at 31–61 % w/w to Turbaba 15 °C (a) column (not Doroshevskii); confirmed Doroshevskii 15 °C (b) complete 0–100 % w/w with no gaps; corrected bibliography ref 82 attribution from Doroshevskii to Turbaba; corrected table caption (5th decimal = qualified precision, not reference numbers).