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Oil spheres that float
Science at Home |
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Materials
 Glass.
Dropper.
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Compounds
Water.
Oil.
Pigment.
Ethyl alcohol.
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Videos: download.avi (217 KB)
Pictures: 
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Procedure
1. Pour red pigment in water. 2. Pour the red water to a glass. 3. Add, carefully, the ethyl alcohol to the glass. (you can pour the alcohol with the help of a tablespoon cable. Try to add the alcohol slowly in a way that it isn't mixed with the water) 4. With a dropper, add oil drops to the two-phase system. (try to disperse the drops to turn the effect more evident) |
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Why?
Oil spheres that float between water and alcohol! As well as in the experiment Liquids density, in this experiment it can be observed that ethyl alcohol is "lighter" than water. When adding the alcohol carefully, this forms a different phase that floats in water. On the other hand, when we add the oil it is deposited in the surface that separates the alcohol and water, this because it is a "lighter" liquid than water and "heavier" than alcohol. Due to repulse molecular forces between water and oil, the oil drops acquire an almost spherical form. If these repulsive forces were not verified, we would have a very thin oil layer floating in water. The final form of the oil drops is not spherical due to gravity.
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