Glitter Globe

기름과 알코올이 섞여 어떤 현상이 벌어지는지를 관찰한다.

Rubbing alcohol, Vegetable oil, A plastic container or glass jar, Small beads, sequins, glitter, or other tiny, shiny things

1. Fill about 1/4 of the jar with rubbing alcohol. 2. Pour vegetable oil into the jar. Leave about 1/2 an inch of air at the top of the jar. Let the globs of oil settle.   3. Drop tiny, shiny things into the jar. Use as many as you want. Don't use anything too heavy-like a marble-that might break the jar when you shake it.           4. When all the tiny things are in the jar, carefully pour in more oil until the jar is completely full-right up to the rim.         5. Screw the lid of the jar on very tightly. 6. Let the oil settle again. That will take about 5 or 10 minutes. Now spin the jar instead of shaking it. What happens?

Why doesn't the oil float on top of the alcohol? Since oil floats on top of water, you might have thought that oil would float on top of alcohol, too. But the oil sinks to the bottom and the alcohol floats on top of the oil. Even though water and alcohol are both clear liquids, they have different densities. Alcohol floats on top of oil because a drop of alcohol is lighter than a drop of oil the same size. - 물위에는 기름이 뜨지만 같은 투명한 액체라 하더라도 알코올은 물과 다른 밀도이기 때문에 기름 위에 알코올이 뜨게 되는 것이다.