Question

Glass in window panes of an old building are found to have a thick bottom and thinner top as well as it is found milky.why?

Answer 1

Answer:

The glass panes fixed to windows or doors of old buildings are found to be thicker at the bottom due to the fluid nature of glass. The glass flows down very slowly and makes the bottom portion slightly thicker.

Glass is an amorphous solid which is a supercooled liquid of high viscosity and hence possesses fluidity. Due to this property it is thicker at the bottom than at the top. Milkiness of glass is due to the fact that it undergoes heating during the day and cooling at night, i.e., annealing over a number of years.

Explanation:

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