Question

what space must be left between two iron rails 10m long laid at 15°c in winter when the highest temperature in summer is 55°c​

Answer 1

Gap left ≥ Change in length on heating

Gap left ≥ Initial length×Coefficient of linearexpansion×change in temperature

change in temperature= 55-15 = 40°C

Coefficient of linearexpansion of iron ≈ 12×10^-⁶ /°C (approx , idk the exact value)

Gap=(10× Coefficient of linearexpansion of iron×40)m

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