What is meniscus in fluid?
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 concave or convex, depending on the liquid and the surface.
Does water 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.
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.
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.
Why the meniscus on the surface of water is either concave or convex?
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.
Do all liquids have a meniscus?
Most liquids, including water, show a concave meniscus but a great example of a convex meniscus is liquid mercury in a glass container.
Is liquid measured at the meniscus?
For a concave meniscus, the volume of the liquid in the container is read from the bottom of the curve. You may notice a ‘line’ of liquid at the very top, forming the curve itself. The bottom of the curve is the lower side of this line. And just like with baking measurements, always read the meniscus at eye level.
Which properties of water contribute to the formation of the meniscus density?
Surface Tension The meniscus of water in a graduated cylinder forms because of water’s hydrogen bonding.
Why are waters cohesive quizlet?
Cohesion refers to the binding together of two molecules of the same type, for instance two water molecules. Water molecules are cohesive – they cohere, which means they stick to each other, due to hydrogen bonding.
Why water surface is concave?
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. When liquid mercury is confined in a tube, its surface (meniscus) has a convex shape because the cohesive forces in liquid mercury tend to draw it into a drop.
Does the meniscus of water go up or down?
Water has an upward meniscus, mercury has a downward meniscus. 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. A concave meniscus, which is what you normally will see, occurs when the molecules of the liquid are attracted to those of the container.
What causes a 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.
What is a meniscus?
Define meniscus? 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.
What causes a concave meniscus to form?
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.