At 18C, a rod is exactly 20.05 cm long on a steel ruler. Both the rod and the ruler are placed in an oven at 303C, where the rod now measures 20.21…

At 18°C, a rod is exactly 20.05 cm long on a steel ruler. Both the rod and the ruler are placed in an oven at 303°C, where the rod now measures 20.21 cm on the same ruler. What is the coefficient of linear expansion for the material of which the rod is made?