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Bi-Metallic Strip
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== Demonstration == # Show the Bi-Metallic Strip to the audience, and point out the two metals on it (Bronze and Nickel). # Use the Dry Ice or similar Cryogen to cool the strip. It will start to bend over! The more you cool it, the more extreme the bend will get. # Let the strip warm up for a minute or so. During this time, ask the audience to identify which side it bent towards. What can they deduce from this? # Use the Blowtorch or similar heat source to warm the strip. It will now start bending, but in the opposite direction! The longer you heat it, the more it will bend. # Compare earlier thoughts to this result. What do they think is happening?
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