Steel expand 11 pars in million for each 1C change. think about the 1.3-km main span of steel for the Golden Bridge. if the span had no expansion joints, show that the span would be 0.21 m longer for a 15 C increase in temperature. [ use the formula (delta) L= a L. (delta)T, where L. is the original length, a is the "coefficient of expansion" that for steel is (1/1000,0000) per C, and (delta) T is the change in temperature]