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Air usually constitutes up to half of the volume of commercial ice creams and takes the form of small spherical bubbles interspersed within a matrix of frozen matter. The thermal conductivity of ice cream that contains no air is kna = 1.1 W/m ∙ K at T = –20°C. Determine the thermal conductivity of commercial ice cream characterized by ε = 0.20, also at T = –20°C.
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