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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?  Any problems with this page? Send URL to
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