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Glass plate fixed to window or door of old building invariable are found which is thick at the bottom and thin at above because glasses show property called fluidity when glasses absorb heat its (in solid molecule are in random motion ) molecule get more vibrated and the bond between molecules become loose due to presence of gravitational force molecule Seattle down to the window pan .
HII........∆
THERE IS YOUR ANSWER...... ∆
FIRSTLY I MAKE SURE YOU KNOW THAT GLASS ALSO SHOW Fluidity...
AS WE KNOW THERE IS A FORCE ACTS BETWEEN THE DIFFERENT LAYER OF THE GLASS NAMELY VISCOUS FORCE.......... ©
WHICH EXIST IN FLUIDS MAINLY.
THE VISCOUS FORCE IN THE GLASS IS QUITE STRONG THAN THE OTHER SO WHEN WE TALKS ABOUT GLASS PLATE ON THE WINDOW WHICH HAS VISCOUS FORCE BETWEEN THE LAYER WE SEE THAT THE GRAVITY HELPS DIFFERENT LAYER TO BREAK THE BOUNDATION OF VISCOUS FORCE AND GET ACCUMULATE AT LOWER END THAT'S WHY WE SEE LOWER END MORE THICKER THAN THE UPPER ONE..... ¶
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