- A bimetallic compound strip of brass and iron is 10 cm long and 20°C. It is held horizontally with the iron on top. When heated over a Bunsen burner, the temperature of the brass is 800°C and the iron is 750°C. Brass has a coefficient of linear expansion 19 * 10 ^ - 6 /^ C while iorn is 12 * 10 ^ - 6 /^ o C. What is the final length of (a) brass strip? (b) iron strip? c) Calculate the difference of lengths of iron and the brass.