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Thermodymaniacs
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A co-worker who was absentmindedly fiddling wirh a rubber band suddently yelped, "Check this out!"
It seems he had stumbled on the basics of refrigeration. Stretching and relaxing a rubber band repeatedly makes it hot.
While in the stretched position, it is hotter than the surrounding air and, consequently, rejects heat.
When the rubber band is subsequently relaxed and touched to your lip, amazingly, it is cold.
The four stages of refrigeration can be demonstrated ...
