What is meniscus in surface tension?
The meniscus is the curve caused by surface tension in the upper surface of a liquid. A convex meniscus occurs when the molecules have a stronger attraction to each other (cohesion) than to the material of the container (adhesion), causing the surface of the liquid to cave downward.
What type of meniscus is found on the surface of water in a test tube?
Water meniscus is convex, mercury menisucs is concave 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.
Why does the meniscus of water curve upwards?
When water is put in a measuring cylinder, the meniscus curves upwards. This is due to the greater adhesive force between the water molecules and the measuring cylinder than the cohesive force within the water molecules.
Why does water stick to surfaces?
Water is very adhesive; it sticks well to a variety of different substances. Water sticks to other things for the same reason it sticks to itself – because it is polar so it is attracted to substances that have charges. In each of these cases water adheres to or wets something because of adhesion.
What is meniscus in water?
A meniscus is a curve in the surface of a molecular substance (water, of course) when it touches another material. With water, you can think of it as when water sticks to the inside of a glass. • Water Science School HOME • Water Properties topics
Which properties of water contribute to the formation of the meniscus quizlet?
Meniscus happen because of adhesion and has to do with waters fairly high surface tension. Water molecules are attracted to other molecules, but since they also like to stick to water molecules, when they touch the glass they cling and others will too. They go up as far as cohesion and gravity allow.
What properties of water allow it to form a meniscus?
Adhesion is responsible for a meniscus and this has to do in part with water’s fairly high surface tension. Water molecules are attracted to the molecules in the wall of the glass beaker.
What properties of water contribute to the formation of meniscus?
What property of water allows water skate bugs to stay on the surface of a pond and not sink?
surface tension
These creatures are known by a variety of names including water skaters, water striders, pond skaters, and other equally descriptive names. They take advantage of a property called surface tension to stay above the water and not sink.
What properties of water contribute to the formation of the meniscus?
Why is one of the properties of water a sticky or elastic surface?
Why is one of the properties of water a sticky or elastic surface, known as surface tension, that insects can walk on? The attraction between the positive and negative parts of the molecules. The water surface is elastic because of the capillary action.
How is meniscus water measured?
The key to getting an accurate reading, is to measure the center of the meniscus whether it be concave or convex. E.g. with a concave meniscus, measure the bottom of the meniscus and for convex meniscus, take the reading from the top of the meniscus.
What is the shape of the meniscus in a liquid?
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.
What is a meniscus in a graduated cylinder?
A meniscus is the curved surface at the top of a column of liquid. In a science class, this liquid is usually water or some sort of aqueous solution, and the column is usually a graduated cylinder or a pipet. As you may have noticed, when water is in such a thin glass tube, it does not have a flat surface at the top.
How are liquid menisci used in surface science?
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. In a contact angle measurement, the shape of the menisci is measured with a balance or optically with a digital camera.
What causes a concave meniscus in a glass tube?
It all depends on if the molecules of the liquid are more attracted to the outside material or to themselves. 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.