THIS DAY IN SCIENCE: Ford Model T - 1st Car On Assembly Line, Cost $825 in 1908

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This activity illustrates the effect of intermolecular forces on surface tension of a liquid. Students attempt to place drops of various types of liquids on the face of a penny (or any available coin). The substances with stronger intermolecular forces have greater surface tensions and hence it is possible to place more drops on the face of the penny.

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