Materials Required A box of paper clips. A glass Water How to do it Fill the glass with water up to the brim of the glass. Slowly immerse the paper clips one after another into the water. Let the child observe what happens. The water does not spill out until a certain amount of pins is dipped into the water. Let the child observe the water surface. It will look like a expanded surface on top. Explanation This is due to the surface tension of the water which tries to pull molecules toward it.
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