Water property lookup

Properties of Water at Standard Pressure

Look up common water properties at 1 atm by temperature for thermodynamics, fluid mechanics, heat transfer, and laboratory calculations.

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Results interpolate density, viscosity, heat capacity, conductivity, and vapor pressure from the 1 atm water property table.

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Reference table

Water properties at 1 atm

Temp (°C)	Density (kg/m³)	Dynamic Viscosity (mPa·s)	Kinematic Viscosity (10^-6 m²/s)	Specific Heat Cp (kJ/kg·K)	Thermal Conductivity (W/m·K)	Vapor Pressure (kPa)
0	999.84	1.792	1.792	4.218	0.561	0.611
5	999.97	1.519	1.52	4.2	0.564	0.872
10	999.7	1.307	1.308	4.192	0.567	1.228
15	999.1	1.139	1.14	4.187	0.569	1.705
20	998.21	1.002	1.003	4.182	0.572	2.338
25	997.05	0.89	0.892	4.181	0.606	3.169
30	995.65	0.798	0.8	4.18	0.613	4.246
35	994.03	0.719	0.722	4.181	0.619	5.628
40	992.21	0.653	0.656	4.182	0.626	7.382
45	990.2	0.596	0.6	4.184	0.632	9.573
50	988.04	0.546	0.551	4.186	0.638	12.35
55	985.71	0.501	0.506	4.188	0.644	15.72
60	983.28	0.46	0.466	4.19	0.65	19.92
65	980.72	0.424	0.43	4.193	0.656	25.03
70	978.03	0.391	0.397	4.196	0.661	31.12
75	975.21	0.361	0.367	4.199	0.667	38.24
80	972.27	0.335	0.342	4.202	0.672	46.4
85	969.2	0.311	0.318	4.205	0.677	55.76
90	966	0.29	0.297	4.208	0.682	66.41
95	962.66	0.271	0.279	4.211	0.686	78.51
100	959	0.282	0.29	4.216	0.679	101.33

Formulas

Useful water property relationships

Kinematic viscosity

nu = mu / rho

Dynamic viscosity divided by density

Sensible heat

Q = m c_p Delta T

Heating or cooling energy for liquid water

This combined water property table is useful for early heat transfer estimates, pipe flow calculations, pump sizing, vapor pressure checks, and thermal system modeling.

Reference

What the water property values mean

Density

Mass per unit volume, used for buoyancy, mass flow, hydrostatic pressure, and hydraulic calculations.

Viscosity

Resistance to flow, used for Reynolds number, pressure drop, pump sizing, and pipe flow estimates.

Specific heat

Heat required to raise water temperature, used for heating, cooling, and energy storage calculations.

Vapor pressure

Equilibrium pressure of water vapor, used for boiling, evaporation, cavitation, and phase-change checks.

FAQ

Water property questions

What properties are included in the 1 atm water table?

The table includes density, dynamic viscosity, kinematic viscosity, specific heat, thermal conductivity, and vapor pressure from 0 to 100 C.

Why use values at 1 atm?

Atmospheric-pressure values are convenient for laboratory, HVAC, heat transfer, and many open-system engineering calculations.

Are these values valid at high pressure?

No. For pressurized systems, use property data at the actual system pressure and temperature.

Water property tables

Water PropertiesDensity

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