Salts & brines

Sodium nitrate · NaNO3

Name: Sodium nitrate (NaNO3) aqueous solution properties
Creator: ProcessConvert
License: https://creativecommons.org/licenses/by/4.0/

Sodium nitrate (NaNO3) is a salt; this page gives computed density, dynamic viscosity and specific heat capacity for aqueous solutions from 2–40 wt% and 10–60 °C.

Values are computed from the Laliberté (2009) aqueous-electrolyte correlation and tabulated over 2–40 wt% and 10–60 °C.

Also known as: Chile saltpetre, Soda niter, Nitratine
CAS number: 7631-99-4
Tabulated range: 2–40 wt% · 10–60 °C
Properties: Density · Dynamic viscosity · Specific heat capacity · Specific gravity

At 20 wt% · 20 °C

reference snapshot

Density: 1142.7kg/m³
Density: 1.1427g/cm³
Specific gravity: 1.145
Viscosity: 1.281cP
Specific heat: 3521J/kg·K

Explore

Read a value at any point

Move the sliders to interpolate between the tabulated grid points. The readout and chart never go outside the validated 2–40 wt% and 10–60 °C range, and every number is interpolated from the committed table below — nothing is computed from a chemistry model in your browser.

Interactive explorer

Values are interpolated between the tabulated grid points below — sliders stay within the validated 2–40 wt% and 10–60 °C range.

Concentration21 wt%

Temperature20 °C

Density: 1150.7 kg/m³
Density: 1.1507 g/cm³
Specific gravity: 1.153
Dynamic viscosity: 1.308 cP
Specific heat: 3494 J/kg·K

Density (kg/m³) vs wt% NaNO3 at 20 °C — Sodium nitrate.

Why it matters

What the numbers tell you

At 20 wt% and 20 °C, aqueous sodium nitrate has a density of about 1143 kg/m³ (1.143 g/cm³) — roughly 1.14× the density of water. It also has a dynamic viscosity of about 1.281 cP, against roughly 1 cP for water at the same temperature, and a specific heat of about 3.52 kJ/kg·K, about 84% of water’s 4.18 kJ/kg·K. Those differences carry straight into volume-to-mass conversions, pump and pipe sizing, and the heat needed to change its temperature.

Common grades

A few working strengths

Properties at 20 °C for a handful of concentrations in everyday use, read from the committed grid (interpolated between tabulated points where a grade falls between them). The full table follows below.

wt% NaNO3	°C	Density kg/m³	SG	Viscosity cP	Sp. heat J/kg·K
10	20	1067.3	1.069	1.098	3810
20	20	1142.7	1.145	1.281	3521
30	20	1225.2	1.227	1.619	3256
40	20	1316.1	1.318	2.235	3000

Sources

Where the numbers come from

Every value on this page is computed by a deterministic model — none is entered by hand. The generating method and the references it is checked against:

▸Laliberte, M. (2009). A Model for Calculating the Heat Capacity of Aqueous Solutions, with Updated Density and Viscosity Data. J. Chem. Eng. Data 54(6), 1725-1760. doi:10.1021/je8008123
▸CRC Handbook of Chemistry and Physics - Concentrative Properties of Aqueous Solutions (density and viscosity at 20 degC; primary data Wolf, A.V., 1966)
▸CRC Handbook of Chemistry and Physics - Aqueous Solubility of Inorganic Compounds at Various Temperatures (solubility bounds for the tabulated range)

Model: thermo==0.4.0 (chemicals==1.3.0) - Laliberte 2009 electrolyte correlation · Generated 2026-06-07

The committed data file for this page is published as JSON on GitHub under CC BY 4.0.

Validation

Checked against a cited value

The model is cross-checked at one independently cited reference point. The page is published only because this check passes.

Property / point	Density · 20 wt% · 20 °C
Cited reference value	1142.9 kg/m3
Model computed	1142.69 kg/m3
Error vs reference	0.019% (tolerance 1%)

CRC Handbook of Chemistry and Physics - Concentrative Properties of Aqueous Solutions. CRC Handbook of Chemistry and Physics, Concentrative Properties of Aqueous Solutions (all data at 20 degC; primary data Wolf, A.V., Aqueous Solutions and Body Fluids, Hoeber, 1966), sodium nitrate: 20.0 mass % at 20 degC = 1.1429 g/cm3.

Full tables

Every tabulated point

Rows are temperature (°C); columns are concentration (wt% NaNO3). Read the cell at the intersection. Specific gravity is density divided by the model water reference of 998.2 kg/m³ at 20 °C.

Density — kg/m³

°C \ wt%	2	4	6	8	10	12	14	16	18	20	22	24	26	28	30	32	34	36	38	40
10	1013.4	1027.3	1041.4	1055.8	1070.4	1085.2	1100.3	1115.7	1131.3	1147.2	1163.5	1180.0	1196.8	1213.9	1231.3	1249.1	1267.2	1285.7	1304.5	1323.7
15	1012.6	1026.4	1040.3	1054.5	1069.0	1083.7	1098.6	1113.8	1129.3	1145.1	1161.1	1177.5	1194.1	1211.1	1228.3	1245.9	1263.9	1282.2	1300.9	1319.9
20	1011.6	1025.2	1039.0	1053.0	1067.3	1081.9	1096.7	1111.7	1127.1	1142.7	1158.6	1174.8	1191.3	1208.1	1225.2	1242.7	1260.5	1278.7	1297.2	1316.1
25	1010.3	1023.7	1037.4	1051.3	1065.5	1079.9	1094.6	1109.5	1124.7	1140.1	1155.9	1172.0	1188.3	1205.0	1222.0	1239.3	1257.0	1275.0	1293.5	1312.2
30	1008.7	1022.1	1035.6	1049.4	1063.4	1077.7	1092.2	1107.0	1122.1	1137.4	1153.1	1169.0	1185.2	1201.8	1218.7	1235.9	1253.5	1271.4	1289.7	1308.4
35	1007.0	1020.2	1033.6	1047.3	1061.2	1075.4	1089.8	1104.4	1119.4	1134.6	1150.1	1166.0	1182.1	1198.5	1215.3	1232.4	1249.9	1267.7	1285.9	1304.5
40	1005.1	1018.2	1031.5	1045.0	1058.8	1072.9	1087.2	1101.7	1116.6	1131.7	1147.1	1162.8	1178.8	1195.2	1211.9	1228.9	1246.3	1264.0	1282.2	1300.7
45	1003.0	1015.9	1029.1	1042.6	1056.3	1070.2	1084.4	1098.9	1113.6	1128.6	1144.0	1159.6	1175.5	1191.8	1208.4	1225.4	1242.7	1260.4	1278.4	1296.9
50	1000.7	1013.6	1026.7	1040.0	1053.6	1067.4	1081.5	1095.9	1110.6	1125.5	1140.8	1156.3	1172.2	1188.4	1204.9	1221.8	1239.0	1256.7	1274.7	1293.1
55	998.2	1011.0	1024.0	1037.3	1050.8	1064.6	1078.6	1092.9	1107.4	1122.3	1137.5	1153.0	1168.8	1184.9	1201.4	1218.2	1235.4	1253.0	1271.0	1289.4
60	995.7	1008.4	1021.3	1034.5	1047.9	1061.5	1075.5	1089.7	1104.2	1119.0	1134.1	1149.5	1165.3	1181.4	1197.8	1214.6	1231.8	1249.3	1267.3	1285.6

Dynamic viscosity — cP (mPa·s)

°C \ wt%	2	4	6	8	10	12	14	16	18	20	22	24	26	28	30	32	34	36	38	40
10	1.322	1.339	1.359	1.383	1.412	1.445	1.484	1.529	1.580	1.639	1.707	1.784	1.871	1.970	2.083	2.211	2.357	2.522	2.711	2.925
15	1.154	1.170	1.190	1.213	1.239	1.269	1.304	1.344	1.390	1.442	1.501	1.568	1.644	1.730	1.827	1.936	2.061	2.201	2.361	2.542
20	1.017	1.034	1.052	1.074	1.098	1.126	1.158	1.194	1.235	1.281	1.334	1.393	1.459	1.534	1.619	1.714	1.821	1.943	2.080	2.235
25	0.905	0.921	0.939	0.959	0.982	1.008	1.037	1.070	1.107	1.148	1.195	1.248	1.307	1.373	1.447	1.531	1.625	1.731	1.850	1.984
30	0.812	0.827	0.845	0.864	0.885	0.909	0.936	0.966	1.000	1.037	1.079	1.127	1.179	1.238	1.305	1.379	1.462	1.555	1.659	1.777
35	0.733	0.748	0.765	0.783	0.803	0.825	0.850	0.878	0.909	0.943	0.982	1.024	1.072	1.125	1.184	1.251	1.325	1.407	1.500	1.604
40	0.666	0.681	0.697	0.714	0.733	0.754	0.777	0.803	0.831	0.863	0.898	0.937	0.980	1.028	1.082	1.142	1.208	1.282	1.365	1.458
45	0.609	0.623	0.638	0.655	0.673	0.693	0.714	0.738	0.765	0.794	0.826	0.862	0.901	0.945	0.994	1.048	1.108	1.175	1.250	1.333
50	0.560	0.573	0.588	0.604	0.621	0.639	0.660	0.682	0.707	0.734	0.764	0.797	0.833	0.873	0.918	0.967	1.022	1.083	1.150	1.226
55	0.517	0.530	0.544	0.559	0.575	0.593	0.612	0.633	0.656	0.681	0.709	0.740	0.773	0.810	0.851	0.897	0.947	1.003	1.064	1.133
60	0.479	0.492	0.505	0.519	0.535	0.552	0.570	0.590	0.611	0.635	0.661	0.689	0.721	0.755	0.793	0.835	0.881	0.932	0.989	1.051

Specific heat capacity — J/kg·K

°C \ wt%	2	4	6	8	10	12	14	16	18	20	22	24	26	28	30	32	34	36	38	40
10	4097	4012	3935	3864	3798	3735	3676	3619	3563	3509	3456	3404	3352	3301	3250	3200	3149	3099	3049	2999
15	4096	4014	3939	3870	3804	3743	3683	3626	3570	3515	3462	3409	3357	3305	3253	3202	3151	3100	3050	2999
20	4096	4016	3943	3875	3810	3749	3689	3632	3576	3521	3467	3413	3360	3308	3256	3204	3153	3102	3051	3000
25	4096	4018	3947	3879	3815	3754	3695	3637	3580	3525	3470	3417	3363	3311	3258	3206	3154	3103	3052	3001
30	4096	4020	3950	3883	3820	3758	3699	3641	3584	3529	3474	3420	3366	3313	3260	3208	3156	3104	3053	3002
35	4097	4022	3953	3887	3823	3762	3703	3645	3588	3532	3477	3423	3369	3315	3262	3210	3158	3106	3054	3003
40	4098	4025	3956	3890	3827	3766	3706	3648	3591	3535	3480	3425	3371	3318	3264	3212	3159	3107	3056	3004
45	4099	4026	3958	3892	3830	3769	3709	3651	3594	3538	3482	3427	3373	3319	3266	3213	3161	3108	3057	3005
50	4101	4029	3960	3895	3832	3771	3712	3654	3597	3540	3485	3430	3375	3321	3268	3215	3162	3110	3058	3006
55	4103	4031	3963	3898	3835	3774	3715	3656	3599	3543	3487	3432	3377	3323	3270	3217	3164	3111	3059	3008
60	4105	4034	3966	3901	3838	3777	3718	3659	3602	3545	3489	3434	3380	3326	3272	3219	3166	3113	3061	3009

Typical values

Sodium nitrate solution properties at 25 °C

At 25 °C, 10 wt% sodium nitrate has a density of about 1065.5 kg/m³, a dynamic viscosity of about 0.982 cP and a specific heat capacity of about 3815 J/kg·K. At 25 °C, 30 wt% sodium nitrate has a density of about 1222.0 kg/m³, a dynamic viscosity of about 1.447 cP and a specific heat capacity of about 3258 J/kg·K. At 25 °C, 40 wt% sodium nitrate has a density of about 1312.2 kg/m³, a dynamic viscosity of about 1.984 cP and a specific heat capacity of about 3001 J/kg·K.

Limitations

Before you use these numbers

▸Laliberte (2009) aqueous-electrolyte correlation for NaNO3-water. Tabulated for 2-40 wt% over 10-60 degC. Saturation is about 45 wt% NaNO3 at 10 degC, rising with temperature, so the 40 wt% ceiling keeps the whole table below saturation. Concentrations are NaNO3 by mass. Values are for preliminary design; verify against vendor data for critical service.
▸Values are tabulated only inside the 2–40 wt% and 10–60 °C ranges shown; the correlation is not extrapolated beyond them here.
▸Figures are for a pure sodium nitrate–water system. Commercial grades contain impurities (for example chloride in some caustic grades) that shift density and viscosity; check the supplier's data sheet for a specific product.
▸Use for preliminary design; verify for critical service.

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