1. The problem statement, all variables and given/known data ""If the coefficient of thermal expansion of steel is 1.1 x 10^ -5 ℃^ -1 and a railway rail is 4. 5 m long, how much would the length Δ L of the rail increase by if the temperature changes from -10 ℃ to 30 ℃? "" Could anyone direct me to a youtube video, or something that could help understand how to work this out and get the answer. 2. Relevant equations Im not sure 3. The attempt at a solution Not sure. Please and thank you for your help.