schoolscienceproject.blogspot.in
Hanging water
Fill a glass to
overflowing with water and lay a post cardon it. Support
the card with one hand, turn the glass upside down and remove
your hand from the card. it remains on the glass, and
allows no water to escape.With a glass of
normal height, a weight of water of about 2 ounces presses on each square inch
of card. On the
other hand the pressure of air from below is about one- hundred times as great
on
each square
inch, and presses the card so firmly against the glass that no air can enter at
the side and so no water can
flow out
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