A glass window is to be fit in an aluminium frame. The temperature on the working day is 40∘C and the glass window measures exactly 20 c m × 30 cm. What should be the size of the aluminium frame so that there is no stress on the glass in winter even if the temperature drops to 0∘ C ? Coefficients of linear expansion for glass and aluminium are 9.0×10−6 ∘C−1 and 24×10−6 ∘C−1 respectively.

A glass window is to be fit in an aluminium frame. The temperature on

1.	A glass window is to be fit in an aluminium frame. The temperature on the working day is 40∘C and the glass window measures exactly 20 c m × 30 cm. What should be the size of the aluminium frame so that there is no stress on the glass in winter even if the temperature drops to 0∘ C ? Coefficients of linear expansion for glass and aluminium are 9.0×10−6 ∘C−1 and 24×10−6 ∘C−1 respectively.
Answer» A glass window is to be fit in an aluminium frame. The temperature on the working day is $40^{\circ} C$ and the glass window measures exactly 20 c m $\times$ 30 cm. What should be the size of the aluminium frame so that there is no stress on the glass in winter even if the temperature drops to $0^{\circ} C$ ? Coefficients of linear expansion for glass and aluminium are $9.0 \times 10^{- 6}^{\circ} C^{- 1}$ and $24 \times 10^{- 6}^{\circ} C^{- 1}$ respectively.

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