Let’s use the GRASS method to solve this problem.

**Given:** Original length ##(L_o)## = 300.0 m Coefficient of Linear expansion of steel ##(alpha) = 11 times 10^{6 circ}C^-1## Temperature change ##(Delta T) = 40-22 = 18.0 ^circC##

**Required to find:** Change in length ##(Delta L)##

**Analysis:** The formula for figuring out this question is

##Delta L = alpha L_o Delta T##

The unknown value is already isolated, so we do not need to manipulate the formula.

**Solve and Significant Figures:**

##Delta L = (11 times 10^6 ^o C^-1) (300.0 m) (18^oC)## ##Delta L = 0.0594 m##

Convert to centimeters by multiplying by 100: ##Delta L = 5.94 cm##

This means the Eiffel Tower is 5.94 cm taller on a hot day of 40 degrees than it is at 22 degrees.