Soap: Making Everyday Chemistry Public
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چکیده
This grime is hard to wash off with water, simply because water molecules are more attracted to one another than they are to oil. Oil and water don't mix; thus, they separate into two. We have been taught this since elementary school, with lots of demonstrations. Oil molecules are large and awkward; they are not polar, so water, a very polar molecule, can’t bond with it. This is why when you have dirt on your hands, and try to use only water to wash it off, it does not work. Or, when you try to wash a greasy pan with only water, it just runs off without removing the dirt and grime because the oily particles can’t bond with water. [3]
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