Question:
Two metre scales, one of steel and the other of aluminium, agree at $20^{\circ} \mathrm{C}$. Calculate the ratio aluminiumcentimetre/steel-centimeter at (a) $0^{\circ} \mathrm{C}$, (b) $40^{\circ} \mathrm{C}$ and (c) $100^{\circ} \mathrm{C}$. a for steel=1.1 $\times 10^{-5} /{ }^{\circ} \mathrm{C}$ and for aluminium $=2.3^{\times 10^{-5}} /{ }^{\circ} \mathrm{C}$.
Solution:
