Home Inspection Specification ASTM C108-46(2004) Standard Symbols for Heat Transmission

ASTM C108-46(2004) Standard Symbols for Heat Transmission

SPECIAL PRACTICES RELATING TO HEAT FLOW TERMS
Terms Ending in “ivity”—Terms ending in “ivity” designate characteristics of materials, normally independent of size or shape, sometimes called “specific properties.”
Examples: Conductivity and resistivity.
Terms Ending in “ance”—Terms ending in “ance” designate properties of a particular object, depending not only on the material, but also upon size and shape, sometimes called
“total quantities.”
Examples: Conductance and transmittance.
Terms Ending in “ion”—Terms ending in “ion” designate time rate of the process of transfer; flux, flow rate.
Examples: Conduction and transmission.
Transmission—“Transmission,” “transmissivity,” “transmittance” usually refer to transfer by one or more of the processes of conduction, convection, and radiation.
Conduction—“Conduction,” “conductivity,” “conductance” usually refer to transfer within a medium, and without bodily displacement as occurs with convection, and without transfer
at a distance as occurs with radiation.

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Last updated: 2024-01-03
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