http://www.threedollarsquirrel.com/glass-rods/
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The active element of a certain laser is an ordinary glass rod 25 cm long and 1.2 cm in diameter.?
The active element of a certain laser is an ordinary glass rod 25 cm long and 1.2 cm in diameter. If the temperature of the rod increases by 79°C.
(a) Find its increase in length.
(b) Find its increase in diameter.
(c) Find its increase in volume.
The coefficient of thermal expansion for glass is about 9 x 10 ^ -6 1/degrees C.
(a) The increase in length is found by the equation
Change in Length = Length * coefficient of linear expansion * change in temperature
(b) and (c) are similar. The coefficient of area expansion is the linear coefficient squared, and the coefficient of volume expansion is the linear coefficient cubed.
MIT Physics Demo -- Rubber and Glass Rods with Tinsel and Balloon