Question

the window panes of the old buildings are thick at the bottom.Why?

Answer 1

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.

Answer 2

old windows are made up of glass & they have property of flowing from higher level to lower level so they are thik. from the bottom