Stuck in someone else's frames? break free!
|| SNOW JOB
For this experiment you need some dry ice.
Remember, NEVER touch dry ice with your bare hands, and keep
the dry ice in a closed container when it is not in use.
Now prepare a cloud.
To do this, ask your teacher to put some ice and a handful of
salt in a large fruit juice can.
Set a smaller can on the ice so that the tops of both cans
are even. Ask your teacher to pack more ice and salt into
the space between the two cans, then exhale into the smaller
can. A few small pieces from the dry ice need to be dropped
into the cloud your breath made.
Shine a flashlight into the small can, and exhale gently into
the cloud at two-minute intervals. Describe what happens.
Snow is formed directly from water vapor which turns to ice
crystals in a similar way (with no liquid state between the
two states). That is subliming. Isn't it?
The crystals may fall to the ground as snowflakes.
If rain freezes when it contacts an object or the ground, the
result is called sleet. When frozen particles in the air
have additional layers of water frozen to them before they
fall to the ground, the result is called hail.
We have all read that sometimes hailstones are as big as
baseballs. I don't know if that's true or not, but I have
seen car roofs with many large dents in them that were said
to have been caused by hailstones. Those would knock you
silly if you got hit by them.
We've also read that sometimes it has "rained" frogs. We
can't attest to the truth of that, either, but it's fun to
think about. Wouldn't it be great if it rained diamonds?
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