The heat transfer coefficient is a measure of the ability of a material or surface to transfer heat between two fluids or between a fluid and a solid surface. It quantifies the rate of heat transfer per unit area per unit temperature difference between the two entities in contact.
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A heat transfer coefficient relates heat flux through a boundary to a temperature difference: . Its dimensions are power per area per temperature. In a quasistatic ice layer, atmospheric boundary resistance and conductive resistance add in series, giving effective conductance .