What is the difference between concave and convex meniscus?
A concave meniscus, which is what you normally will see, occurs when the molecules of the liquid are attracted to those of the container. This occurs with water and a glass tube. A convex meniscus occurs when the molecules have a stronger attraction to each other than to the container, as with mercury and glass.
What are the examples of convex meniscus?
A convex meniscus appears when molecules of liquid are strongly attracted to each other rather than to the wall of container. Most liquids, including water, show a concave meniscus but a great example of a convex meniscus is liquid mercury in a glass container.
What do you mean by convex meniscus of liquids?
A convex meniscus occurs when the liquid particles are more attracted to each other than to the walls of the container. Measure the meniscus at eye level from the center of the meniscus. For a concave meniscus, this it the lowest point or bottom of the meniscus.
Why do most liquids have concave meniscus?
When liquid water is confined in a tube, its surface (meniscus) has a concave shape because water wets the surface and creeps up the side. Mercury does not wet glass – the cohesive forces within the drops are stronger than the adhesive forces between the drops and glass.
How do you read a convex meniscus?
A meniscus occurs because of surface tension in the liquid and must be read at eye level. For a concave meniscus, the correct volume will be read at the bottom of the curve. For a convex meniscus, the opposite is true and the correct reading will be at the top of the curve.
Do all liquids have a meniscus?
The meniscus of a fluid in a test tube is the result of the capillary force at the gas, liquid, solid interface (or liquid, liquid, solid). So long as the two fluids are not the same substance they will have differing properties (even if slight) and there will always be a meniscus.
What liquids have a concave meniscus?
This occurs between water and glass. Water-based fluids like sap, honey, and milk also have a concave meniscus in glass or other wettable containers. Conversely, a convex meniscus occurs when the particles in the liquid have a stronger attraction to each other than to the material of the container.
What is an example of meniscus?
The definition of a meniscus is the fibrous cartilage in a knee joint, or the curved upper surface of liquid that touches the sides of a jar, or a lens that is convex on one side and concave on the other. When oil is in a jar and the oil has a curve on the top of its surface, this is an example of meniscus.
Which liquids have a concave meniscus?
What liquids have a convex meniscus?
Water meniscus is convex, mercury menisucs is concave This occurs with water and a glass tube. A convex meniscus occurs when the molecules have a stronger attraction to each other than to the container, as with mercury and glass.
Is there any liquid that will not form meniscus?
No. The meniscus is caused by a difference in the surface tension between the liquid and the solid.
Is the meniscus of water concave or convex?
As you can see here, a water meniscus is concave and a mercury meniscus is convex. As this picture shows, a meniscus can go up or down. It all depends on if the molecules of the liquid are more attracted to the outside material or to themselves.
Which is better plano convex or meniscus lens?
Compared to many other forms of optical lenses, meniscus lenses are rarely offered off-the-shelf. While meniscus lenses are primarily used for focusing to small spot sizes or collimation applications, plano convex lenses often offer a superior price-to performance ratio.
What causes liquid to climb the walls of a meniscus?
B: The top of a convex meniscus. A concave meniscus occurs when the particles of the liquid are more strongly attracted to the container ( adhesion) than to each other ( cohesion ), causing the liquid to climb the walls of the container. This occurs between water and glass.
How are Convex menisci used in surface science?
Convex menisci occur, for example, between mercury and glass in barometers and thermometers. Tensiometers measure liquid surface tension based on liquid menisci. The formation of menisci is commonly used in surface science to measure contact angles and surface tension.