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1. Pour about 8cm of water into the glass.
2. Pour about 1/3 cup of vegetable oil into the glass. 3.Shake salt on top of the oil while you count slowly to 5.
 Why does the oil float on the water?
Oil floats on water because a drop of oil is lighter than a drop of water the same size. Another way of saying this is to say that water is denser than oil. Density is a measurement
of how much a given volume of something weighs. Things that are less dense than water
will float in water. Things that are more dense than water will sink. Even though oil and
water are both liquids, they are what chemists call immiscible liquids. That's a fancy word
that means they don't mix. What happens when I pour salt on the oil? Salt is heavier than
water, so when you pour salt on the oil, it sinks to the bottom of the mixture, carrying a blob
of oil with it. In the water, the salt starts to dissolve. As it dissolves, the salt releases the oil,
which floats back up to the top of the water.
- 기름은 물보다 가벼워 서로 섞이지 않고 위에 떠오르게 된다. 하지만 소금을 넣었을 때 소금은 물보다 무거워 기름 덩어리와 함께 바닥에 가라앉게 된다. 하지만 소금이 기름을 분해 하면서 물 위로 다시 떠오르게 되는 것이다. |
Salt Volcano
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