Thermal Resistivity and Conductivity
The ability of a material to resist flow of heat.
Thermal resistance is the ability of a material to resist flow of heat. Thermal resistivity is the reciprocal of thermal conductivity and can be expressed as
r = 1 / k (1)
where
r = thermal resistivity (m^{o}C/W, hr ft^{2} ^{o}F/(Btu in))
k = thermal conductivity (W/(m^{o}C), Btu in/(hr ft^{2} ^{o}F))
Thermal conductivity  k  is the property of a material indicating its ability to conduct heat.
Related Topics

Thermodynamics
Work, heat and energy systems.
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