Meniscus in mercury and water

Meniscus in mercury and water

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Credit: SCIENCE PHOTO LIBRARY

Caption: Meniscus in mercury (left) and water compared. Mercury shows a convex meniscus (the centre is higher than the edges), because internal cohesive forces are stronger than the force between the glass wall and the metal. In contrast, water exhibits a concave meniscus, because the attraction between the wall and the water is stronger than the water's internal cohesion.

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