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Why is glass of window panes of very old...

Why is glass of window panes of very old builidings found to be thicker at the bottom than as the top and why is it milky ?

Text Solution

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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. As a result, it acquires some crystalline character.
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Knowledge Check

  • Assertion : Windowpanes of old building become thicker at the bottom than at the top . Reason : Glass is an extremely viscous liquid .

    A
    If both assertion and reason are true and reason is the correct explanation of assertion .
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion .
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    If assertion is true but reason is false .
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    A
    pressure of water Is very large at the bottom due to Its large depth
    B
    pressure of water Is very small at the bottom due to its large depth
    C
    It Is a custom
    D
    It Is due to surtace tension of water

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    A
    pressure of water Is very large at the bottom due to Its large depth
    B
    pressure of water Is very small at the bottom due to its large depth
    C
    It Is a custom
    D
    It Is due to surtace tension of water

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