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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

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