thermal conductivity

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thermal conductivity

n.
A measure of the ability of a material to allow the flow of heat from its warmer surface through the material to its colder surface, determined as the heat energy transferred per unit of time and per unit of surface area divided by the temperature gradient, which is the temperature difference divided by the distance between the two surfaces (the thickness of the material), expressed in watts per kelvin per meter.

thermal conductivity

n
(General Physics) a measure of the ability of a substance to conduct heat, determined by the rate of heat flow normally through an area in the substance divided by the area and by minus the component of the temperature gradient in the direction of flow: measured in watts per metre per kelvin. Symbol: λ or k Sometimes shortened to: conductivity
References in periodicals archive ?
Varley and Gradwell (1970) called the factor that largely determines the k value of a given stage "a key factor" if "the variations in [the] k-value [of that stage] contribute most to the variations in K" because this is the factor that "appears to be largely responsible for the observed changes in population" (Morris 1959).
I discuss three particular problems: (1) the key factor index, [Beta], cannot indicate qualitative differences in the variation in k value between different stages; (2) the index overlooks the potential importance of a factor that does not vary much in time; and (3) a key factor, identified by a high [Beta] value, can be artificially created by an arbitrary stage division in life tables.
Life tables may contain an interval in which mortality factors are multiple, difficult to identify and to evaluate individually so that they have to be lumped as a single k value.