Solid Substances Thermal Conductivities

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Solid Substances Thermal Conductivities

Thermal Conductivities of Miscellaneous Solid Substances *

Values of k are to be regarded as rough average values for the temperature range indicated
Woods, oven dry, across grain†

* The thermal conductivity of different materials varies greatly. For metals and alloys k is high, while for certain insulating materials, such as glass wool, cork, and kapok, it is very low. In general, k varies with the temperature, but in the case of metals, the variation is relatively small. With most other substances, k increases with rising temperatures, but in the case of many crystalline materials, the reverse is true.
† With heat flow parallel to the grain, k may be 2 to 3 times that with heat flow perpendicular to the grain, the values for wool are taken chiefly from J. D. MacLean, Trans. ASHRAE, 47, 1941, p. 323

Conversion Factor

Quantity	Reference Unit	is equal to	Conversion Factor	Unit
1	BTU (int)/hour-foot-°F	=	12	BTU (int)-inch/hour-square foot-°F
		=	1	BTU (int)/hour-foot-°F
		=	12.008030593291	BTU (thermochem)-inch/hour-sq. foot-°F
		=	1.0006692161076	BTU (thermochem)/hour-foot-°F
		=	0.0041337887321376	calorie (int)/second-centimeter-°C
		=	0.0041365551299507	calorie (thermochem)/second-cm-°C
		=	0.0017307346663714	kilowatt/meter-K
		=	0.017307346663714	watt/centimeter-°C
		=	1.7307346663714	watt/meter-K

Source:

Marks Standard Handbook for Mechanical Engineers