1. The problem statement, all variables and given/known data The active element of a certain laser is an ordinary glass rod 18.7 cm long and 1.33 cm in diameter. If the temperature of the rod increases by 78.5oC, calculate its increase in length. Calculate its increase in diameter. Calculate its increase in volume. 2. Relevant equations change in L=Li*alfa*change in T 3. The attempt at a solution Length increased by 0.0132 cm Diameter increased by 9.396E-4cm I don't know how to get the increase in volume. Could someone please help? Thanks!