KasperCalc: Water Thermal Conductivity

Water Thermal Conductivity

Figures and tables showing thermal conductivity of water (liquid and gas phase) with varying temperature and pressure, SI and Imperial units.

Thermal conductivity is a material property that describes ability to conduct heat. Thermal conductivity can be defined as "the quantity of heat transmitted through a unit thickness of a material — in a direction normal to a surface of unit area — due to a unit temperature gradient under steady state conditions."

The thermal conductivity of water depends on temperature and pressure as shown in the figures and tables below.

Liquid Water Thermal Conductivity vs. Temperature Chart

At 1 bara (atmospheric pressure). Toggle data sets by clicking the legend.

Steam (Gas) Thermal Conductivity vs. Temperature Chart

At 1 bara (atmospheric pressure). Toggle data sets by clicking the legend.

Online Water Thermal Conductivity Calculator

Unit of Temperature:

Temperature (°C):

Liquid Water (0.01 – 99.6 °C / 32 – 211 °F)

Thermal Conductivity (mW/(m·K)):

Thermal Conductivity (Btu/(h·ft·°F)):

Thermal Conductivity (kcal(IT)/(h·m·K)):

Steam / Gas (100 – 900 °C / 212 – 1600 °F)

Thermal Conductivity (mW/(m·K)):

Thermal Conductivity (Btu/(h·ft·°F)):

Thermal Conductivity (kcal(IT)/(h·m·K)):

Water – Thermal Conductivity vs. Temperature (1 bara)

State of water	Temperature (°C)	Thermal Conductivity (mW/(m·K))	kcal(IT)/(h·m·K)	Btu(IT)/(h·ft·°F)
Liquid	0.01	555.75	0.4779	0.3211
	10	578.64	0.4975	0.3343
	20	598.03	0.5142	0.3455
	30	614.50	0.5284	0.3551
	40	628.56	0.5405	0.3632
	50	640.60	0.5508	0.3701
	60	650.91	0.5597	0.3761
	70	659.69	0.5672	0.3812
	80	667.02	0.5735	0.3854
	90	672.88	0.5786	0.3888
	99.6	677.03	0.5821	0.3912
Gas	100	24.57	0.0211	0.0142
	125	26.66	0.0229	0.0154
	150	28.83	0.0248	0.0167
	175	31.09	0.0267	0.0180
	200	33.43	0.0287	0.0193
	225	35.85	0.0308	0.0207
	250	38.34	0.0330	0.0222
	275	40.91	0.0352	0.0236
	300	43.53	0.0374	0.0252
	350	48.98	0.0421	0.0283
	400	54.65	0.0470	0.0316
	450	60.52	0.0520	0.0350
	500	66.58	0.0573	0.0385
	550	72.81	0.0626	0.0421
	600	79.17	0.0681	0.0457
	700	92.28	0.0794	0.0533
	800	105.81	0.0910	0.0611
	900	119.67	0.1029	0.0691

Water – Thermal Conductivity vs. Temperature (14.5 psia)

State of water	Temperature (°F)	Btu(IT)/(h·ft·°F)	Btu(IT)·in/(h·ft²·°F)	mW/(m·K)	×10⁻³ cal(IT)/(s·cm²·K)
Liquid	32	0.3211	3.853	555.73	1.327
	40	0.3273	3.927	566.39	1.353
	60	0.3408	4.089	589.80	1.409
	80	0.3520	4.225	609.30	1.455
	100	0.3615	4.338	625.62	1.494
	120	0.3694	4.433	639.35	1.527
	140	0.3761	4.513	650.91	1.555
	160	0.3817	4.580	660.57	1.578
	180	0.3862	4.635	668.45	1.597
	200	0.3897	4.677	674.49	1.611
	211.3	0.3912	4.694	677.03	1.617
Gas	212	0.0142	0.170	24.57	0.059
	250	0.0152	0.183	26.33	0.063
	300	0.0166	0.199	28.73	0.069
	350	0.0181	0.217	31.25	0.075
	400	0.0196	0.235	33.86	0.081
	450	0.0211	0.254	36.56	0.087
	550	0.0244	0.293	42.24	0.101
	600	0.0261	0.313	45.20	0.108
	650	0.0279	0.334	48.24	0.115
	700	0.0297	0.356	51.35	0.123
	750	0.0315	0.378	54.52	0.130
	800	0.0334	0.400	57.76	0.138
	900	0.0372	0.447	64.41	0.154
	1000	0.0412	0.494	71.27	0.170
	1100	0.0453	0.543	78.32	0.187
	1200	0.0494	0.593	85.53	0.204
	1400	0.0580	0.696	100.35	0.240
	1600	0.0668	0.802	115.63	0.276

1 W/(m·K) = 0.577789 Btu(IT)/(h·ft·°F) = 0.860421 kcal(IT)/(h·m·K)

T (°C) = 5/9 × (T (°F) − 32)

Water Thermal Conductivity – Data & Calculator

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