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In a long glass capillary tube dipped in water, the… | StemPy Lab
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In a long glass capillary tube dipped in water, the water rises 8 cm. Now the same tube is pushed down so that only 5 cm of it sticks out above the water surface. What happens?
Physics
Medium
High School (11–12)
Mechanics › Surface Tension and Capillarity
Created by
StemPy Lab
In a long glass capillary tube dipped in water, the water rises
8
cm
8\ \text{cm}
8
cm
. Now the same tube is pushed down so that only
5
cm
5\ \text{cm}
5
cm
of it sticks out above the water surface. What happens?
Fig. 1: Two capillary tubes in water. (i) A long tube, in which the water rises 8 cm above the outside surface. (ii) The same tube with only 5 cm above the water surface, marked with a question mark.
The water rises to the top of the tube and stops there; the meniscus becomes flatter, with a radius
8
5
\tfrac85
5
8
of its usual value
The water rises to the top and flows out over the edge like a fountain
The water rises only to
5
cm
×
5
8
=
3.1
cm
5\ \text{cm} \times \tfrac58 = 3.1\ \text{cm}
5
cm
×
8
5
=
3.1
cm
The water does not rise at all, because the tube is too short
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