It is stated that glass panes fixed to windows of old buildings are invariably found to be slightly thicker at bottom than at the top. In this case what's he conveying to us. Is it that the glass flows down very slowly at room temperature or at high temperature.

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Solution

It means that though glass is considered as a solid, it actually behaves like a liquid. When kept in a vertical position for a prolonged period, the liquid seems to accumulate towards the lower side due to the effect of gravity.

If temperature is increased from the room temperature, the movement of the glass (supercooled liquid) will increase.

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