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Meniscus. The meniscus (plural: menisci, from the Greek for "crescent") is the curve in the upper surface of a liquid close to the surface of the container.

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Presentation on theme: "Meniscus. The meniscus (plural: menisci, from the Greek for "crescent") is the curve in the upper surface of a liquid close to the surface of the container."— Presentation transcript:

1 Meniscus

2 The meniscus (plural: menisci, from the Greek for "crescent") is the curve in the upper surface of a liquid close to the surface of the container or another object, caused by surface tension.Greekcrescentsurface tension It can be either convex or concave. A convex meniscus occurs when the molecules have a stronger attraction to each other (cohesion) than to the material of the container (adhesion). [1]convex or concavecohesionadhesion [1]

3 Meniscus One can over-fill a glass with mercury and produce a convex meniscus that rises above the top of the glass. Conversely, a concave meniscus occurs when the molecules of the liquid attract those of the container's, causing the surface of the liquid to cave downwards. This can be seen in a glass of water.

4 Meniscus When reading a scale on the side of an instrument filled up with liquid, the meniscus must be taken into account in order to obtain a precise measurement. Manufacturers take the meniscus into account and calibrate their measurement marks relative to the resulting meniscus.

5 Meniscus The measurement is taken with the meniscus at eye level to eliminate parallax error, and at the center of the meniscus.parallax error Read at the top of a convex meniscus, or Read at the bottom of a concave meniscus.

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