Take a tumbler and fill it with water. Cover the
mouth of the tumbler with a thick card similar to
that of a postcard. Hold the tumbler with one hand
svhile keeping the card pressed to its mouth with
your other hand. Turn the tumbler upside down
while keeping the card pressed to its mouth. Make
sure that the tumbler is held vertical. Gently remove
the hand pressing the card.
• What do you observe?
• Does the card get detached allowing the water to
spill?
Also try this activity by using a piece of cloth to
hold the tumbler in an upside down position and
observe.
Do you observe the same result with cloth?
Answers
Answer:
WHAT TO DO:-
Once you have everything in place, fill up the glass with water right upto its brim. Carefully place the glossy side of the postcard down on the rim of the glass. Keep the palm of your hand placed on the card and turn the glass upside down.
WHAT HAPPENS:-
The card remains attached to the rim of the glass and does not allow the water to flow out.
WHY THIS HAPPENS:-
This happens because the air pressure exerted on the card from underneath is greater that the weight of the water inside the glass. This is why the card manages to hold up the water not letting it spill out.
TRY THIS:-
Use regular paper, cloth, a piece of cardboard to do this experiment. Will the water remain upside-down using these materials too?
Explanation:
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