Why are incandescent bulbs typically made of very thin glass?
Solution 48E Step 1 Suppose we are using thick glass for making an incandescent lamp. If the incandescent lamp starts to work, it will convert electrical energy into light energy and heat. As the filament gets heated up, it will heat the thick glass. But we cannot expect uniform heating for the thick glass due to different layers present in it. So, the layer nearest to the filament will absorb more heat and the layer farthest from the filament will absorb less heat. As a result, the expansion of inner layer will be maximum and the expansion will be decreased as we go from inner to the outer layers of the thick glass. So, the expansion will not be uniform and it will shatter. Conclusion If we are using thick glass for making an incandescent lamp, it will shatter due to different expansion rates of the layers of glass.