Capillary action of water in glass tubes. This shows water rising in a narrow glass tube, relative to a wider glass tube. For mercury sinking relative
Capillary action of water in glass tubes. This shows water rising in a narrow glass tube, relative to a wider glass tube. For mercury sinking relative to the outside level of mercury, see image A350/168. The relative rise or fall of a liquid in a narrow glass tube depends on whether the liquid is attracted or repelled by the glass. Water has a positive capillary rise and is drawn up a narrow glass tube. Mercury has a negative capillary rise and sinks down a narrow glass tube, relative to the outside level.
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Photo credit: © ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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