blow into the other end to make air bubbles in the water (Fig.
18). If you can do so, it is a real tube.
Does the thin tube bend easily and does
it spring back when released?
FIG. 18
AIR THROUGH TUBE
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Repeat the experiment with another piece
of No. 2 tubing, but make the thin tube as long as you can.
Can you blow air through the thin tube,
and does it bend very easily indeed?
Repeat with a piece of No. 4 tubing.
These thin hairlike tubes are called
"capillary" tubes, meaning a hair.
Experiment 11. Magic.
You have always heard that water runs
downhill, but you will now see it run uphill and remain there in
a most magic manner.
FIG. 19
WATER RUNS UPHILL
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Cut off 5-inch lengths of No. 6, No. 4,
and No. 2 tubing, stand them side by side in a glass full of water
(Fig. 19), and move them up and down in the water to wet the
inside of the tubes.
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