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Picture of Pipette and Burette, Meniscus and Surface Tension.
Wednesday, March 31, 2010
 This is a picture of a modern burette. This is a picture of a glass pipette. This is a picture of a plastic pipette.Meniscus A meniscus is a curve in the surface of a molecular substance and is produced in response to the surface of the container or another object. It can be either formed in a concave or convex.  A, the bottom of the concave meniscus. B, the top of the convex meniscus. A convex meniscus occurs when the molecules have a stronger attraction to each other than to the container. A concave meniscus occurs when the molecules of the liquid attract those of the container. The measurement is taken with the meniscus at eye level to eliminate parallax error. One can over-fill a glass with water, producing a convex meniscus that raises above the top of the glass, due to surface tension. Surface Tension Surface tension is caused by the attraction between the liquid's molecules by various intermolecular forces. In the bulk of the liquid, each molecule is pulled equally in every direction by neighbouring liquid molecules, resulting in a net force of zero. Credits: |
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