Question

what is meniscus and what re the meniscus formed in water​

Answer 1

Answer:

The formation of curved surface by the exposed surface of a liquid contained in a narrow vessel is called meniscus

Explanation:

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Answer 2

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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. It can be either convex or concave, depending on the liquid and the surface.

(i) in case of water

Concave meniscus is formed. Water is made up of polar molecules, which have positively and negatively charged ends. Since opposites attract, the positive sides attract the negative sides, and all of the molecules stick to one another. This is why water droplets can form. Glass molecules also happen to be polar. Again, since polar molecules like to stick together, the water in a glass tube will actually tend to stick to the sides of the tube. You can see this at the top of the graduated cylinder, where the water will slightly creep up the sides and form a curve, which is the meniscus.

(ii) in case of mercury

Convex meniscus is formed. The reason for this happening is because of cohesion and adhesion. Meniscus is the curve of the upper surface in any liquid. It can be convex with is the curving outward or bulge outward. Concave is just the opposite.