Calculate the change in length of a pyrex glass dish (coefficient of linear expansion for pyrex is 3 x 10^-6 /c) that is 0.3 meters that undergoes a temperature change of 250 c.

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.