Hello, babygirl,Originally Posted bybabygirl

let t be the temperature of a solid in °C. Then the length of it in m with respect to temperature in °C is

k is a constant, describing the change of length per Kelvin. For steel it is .

With your problem you got:

The total change of length at a length of 10 m is:

Remark: The temperature of a railroad track in Middle Europe rates from -60°C up to 90°C)

Greetings

EB