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Plain water freezes at 32 degrees F and salt water freezes at 35.42 degrees F so salt water will freeze faster. In the experiment a drinking straw is inserted into the water after one end of the straw is burned (fired) to seal it off. The straw acts as a hydrometer, which measures the density of water. It is said that after the straw is removed ice crystals form. This has been found not to be true.

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