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Glass is far inferior to paper, plastic and Styrofoam in terms of insulation. Thermal conductivity in terms of BTU/(feet - hour - degrees F) is 1.82 for glass, 0.09 for paper, 0.06 for Styrofoam. The conductivity of plastics varies depending on the materials: for polypropylene and polycarbonate, the thermal conductivity values are 0.69 and 0.35, respectively.
For general scientific use, thermal conductivity is the quantity of heat in Watts (W) that passes in unit. time (usually per second) through a plate of particular area (in square meters (m^2)) and thickness. (in meters (m)) when its opposite faces differ in temperature by one degree kelvin (K).