simple introduction for improved insulating properties for new polyurethane by using turkey feather
Added by Dolores H.
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Polyurethane is a commonly used material for insulation due to its high thermal resistance and durability. Show more…
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Feathers in birds appear to have first been selected for as insulation but later conveyed a new advantage in helping create light aerodynamic surfaces. This switch in function is an example of a homologous structure an adaptation an analogous structure an exaptation
Sri K.
One way to improve insulation in windows is to fill a sealed space between two glass panes with a gas that has a lower thermal conductivity than that of air. The thermal conductivity $k$ of a gas depends on its molar heat capacity $C_{V},$ molar mass $M,$ and molecular radius $r$. The dependence on those quantities at a given temperature is approximately $k \propto C_{V} / r^{2} \sqrt{M}$. The noble gases have properties that make them particularly good choices as insulating gases. Noble gases range from helium (molar mass $4.0 \mathrm{~g} / \mathrm{mol}$, molecular radius $0.13 \mathrm{nm}$ ) to xenon (molar mass $131 \mathrm{~g} / \mathrm{mol}$, molecular radius $0.22 \mathrm{nm}$ ). (The noble gas radon is heavier than xenon, but radon is radioactive and so is not suitable for this purpose.) Estimate the ratio of the thermal conductivity of Xe to that of He. A. 0.015 B. 0.061 C. 0.10 D. 0.17
The ceiling of a single-family dwelling in a cold climate should have an R-value of 30 ft²·F·h/Btu. To achieve such insulation, how thick would a layer of (a) polyurethane foam and (b) silver have to be? The thermal conductivity of polyurethane foam is 0.024 W/m·K, and the thermal conductivity of silver is 428 W/m·K.
Penny R.
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