What you need::
clear plastic softdrink bottle
matches
water
What to do:
Fill the bottle one-third full of warm
water and place the cap on. As warm water evaporates, it adds water vapour to
the air inside the bottle. This is the first ingredient to make a cloud.
Squeeze and release the bottle and observe what happens.
You’ll notice that nothing happens. Why? The squeeze represents the warming
that occurs in the atmosphere. The release represents the cooling that occurs
in the atmosphere. If the inside of the bottle becomes cover with condensation
or water droplets, just shake the bottle to get rid of them.
Take the cap off the bottle. Carefully light a match and
hold the match near the opening of the bottle.
Then drop the match in the bottle and quickly put on the
cap, trapping the smoke inside. Dust, smoke or other particles in the air is
the second ingredient to make a cloud.
Once again, slowly squeeze the bottle hard and release. What
happens? A cloud appears when you release and disappears when you squeeze. The
third ingredient in clouds is a drop in air pressure.
EXPLANATION:
Water vapour, water in its invisible gaseous state, can be
made to condense into the form of small cloud droplets. By adding particles
such as the smoke enhances the process of water condensation and by squeezing
the bottle causes the air pressure to drop. This creates a cloud!
Try this at home!
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