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Activity 8
Take a tin can, some coloured water, a sharp pin/nail and some e cellotape. Make holes
with the pin/nail at four different points, along a vertical line in the tin can, as
in the figure. These holes should be equidistant. Cover the holes with cellotape. Place
the can on a stool and fill it with coloured water. Now, remove the tapes
holes and observe the streams of water coming out of these holes. We observe that
the stream, from the lower holes travel a larger distance. Why? What do we infer?
from the
Tin with four
equidistant holes
Coloured water -
Streams of coloured
water emerging out
Ground level
The emerging water goes out farther from the lower holes; this is because the
pressure of water increases with an increase in the 'depth' of the hole. Hence the
water pressure, at a point, increases with the height of water column above it.
Try repeating the steps of above activity using, say vegetable oil instead of coloured
water. What do we observe? Do the streams of vegetable oil travel the same distance
from the same holes?
We thus observe that, for a particular liquid, the pressure, exerted at any point, is
directly proportional to the height of liquid column above that point (or depth of
that point below the surface); however, this pressure is different for different liquids.
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Yes, you had write it correctly. No mistake.
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