Convex meniscus of viscous golden syrup

Convex meniscus of viscous golden syrup

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Credit: PETER APRAHAMIAN/SCIENCE PHOTO LIBRARY.

Caption: Convex meniscus of a column of golden syrup contained in a thick-walled glass vessel, supporting a paper clip. The meniscus, the curved surface of the viscous syrup is convex due to its surface tension properties: the ability of the liquid surface to act like a stretched membrane and support the paperclip is also due to surface tension. Surface tension effects arise because of the interractions between molecules in the syrup at the boudary with another medium (ie air). In a less viscous liquid (eg water) which wets the containing vessel, the meniscus would be concave. Bubbles of air trapped within the volume of syrup are visible below the surface.

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Keywords: convex, effects, liquid, mensicus, paper clip, physical effect, physics, surface tension, viscosity

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