Thermal conductance is the time rate of steady state heat flow through a unit area of a material or construction induced by a unit temperature difference between the body surfaces, in W/m2⋅K.
Thermal conductivity 1 Thermal conductivity In physics, thermal conductivity, is the, property of a material's ability to conduct heat. It appears primarily inFourier's Law for heat conduction. Definitions The reciprocal of thermal conductivity is thermal resistivity, usually measured in kelvin-meters per watt (K·m·W −1).When dealing with a known amount of material, its thermal conductance and the reciprocal property, thermalresistance, can be described. Thermal conduction is the transfer of internal energy by microscopic diffusion and collisions of particles or quasi-particles within a body or between contiguous bodies. The microscopically diffusing and colliding objects include molecules, atoms, electrons, and phonons. In conduction, the heat flow is within and through the body itself. In contrast, in heat transfer by thermal radiation, the transfer is often between bodies, which may be separated spatially. Thermal Conductivity. Thermal conductivity refers to the amount/speed of heat transmitted through a material. Heat transfer occurs at a higher rate across materials of high thermal conductivity than those of low thermal conductivity.  Main Image: Thermal conductivity, k, is the property of a material's ability to conduct heat. Thermal conductivity is the fundamental property of a material which relates its ability to conduct heat. Heat transfer by conduction involves transfer of energy within a material without any motion of the material as a whole. 1 Thermal conductivity and conductance are similar to electrical conductivity and electrical conductance. 2  Electrical conductivity or specific conductance is the reciprocal quantity, and measures a material's ability to conduct an electric current. Heat transfer occurs at a lower rate across materials of low thermal conductivity than across materials of high thermal conductivity. Correspondingly, materials of high thermal conductivity are widely used in heat sink applications and materials of low thermal conductivity are used as thermal insulation. The thermal conductivity of a material may depend on temperature. The reciprocal of thermal conductivity is called thermal resistivity. In SI units, thermal conductivity is measured in watts per meter kelvin (W /(m · K)). The dimension of thermal conductivity is M 1 L 1 T −3 θ −1. These variables are (M)mass, (L)length, (T)time, and (θ)temperature. In Imperial units, thermal conductivity is measured in BTU /(hr · ft ⋅ °F). Thermal resistance (R) and thermal conductance (C) of the materials are reciprocals of one another and can be derived from thermal conductivity (k) and the thickness of the materials. The C-Therm TCi™ measures thermal conductivity and, therefore, paves the way to determine thermal resistance and thermal conductance. C-value – Thermal Conductance. Thermal conductance is the time rate of steady state heat flow through a unit area of a material or construction induced by a unit temperature difference between the body surfaces, in W/m2⋅K. C-value, hence, is the reciprocal of the R-value and can be expressed as Equation (3) Thermal conductivity (λ) is the intrinsic property of a material which relates its ability to conduct heat. Heat transfer by conduction involves transfer of energy within a material without any motion of the material as a whole.  In physics, thermal conductivity (often denoted k, λ, or κ) is the property of a material to conduct heat. It is evaluated primarily in terms of Fourier's Law for heat conduction. In SI units, thermal conductivity is measured in watts per meter kelvin (W /(m · K)). The dimension of thermal conductivity is M 1 L 1 T −3 θ −1. These variables are (M)mass, (L)length, (T)time, and (θ)temperature. In Imperial units, thermal conductivity is measured in BTU /(hr · ft ⋅ °F).
http://saylor.org/site/wp-content/uploads/2011/04/Thermal_conductivity.pdf https://en.wikipedia.org/wiki/Thermal_conduction http://www.amadamiyachi.com/glossary/glossthermalconductivity http://www.innovateus.net/science/what-thermal-conduction https://en.wikipedia.org/wiki/Thermal_conductivity http://www.ctherm.com/products/tci_thermal_conductivity/helpful_links_tools/thermal_resistance_thermal_conductance/ https://www.nde-ed.org/EducationResources/CommunityCollege/Materials/Physical_Chemical/ThermalConductivity.htm https://en.wikipedia.org/wiki/Thermal_conductivity
what is thermal conductance