The meniscus of a liquid is the upward or downward curve seen at the top of a liquid in a container. The nature of curve whether upward (convex) or downward (concave) depends on the surface tension the liquid and its adhesion capacity to the wall of the container.
WHY DO WE USE meniscus in chemistry?
Meniscus in Chemistry A concave meniscus forms when the liquid molecules are more attracted to the container via adhesion than to each other via cohesion. A convex meniscus occurs when the liquid particles are more attracted to each other than to the walls of the container.
What is meniscus in surface tension?
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 properties of water allows it to form a meniscus?
Finally, when the surface involved is a tube of small diameter with the liquid inside it, if the surface attracts the liquid and the liquid has a high surface tension, then that attraction will cause the liquid to try and climb up the wall of the tube and drag enough fluid up with it to form an upwardly-curved surface …
How do you read a meniscus in chemistry?
If the meniscus is a concave meniscus, read at the lowest level of the curve. If the meniscus is convex, take your measurement at the highest point of the curve. The short answer: Take your measurement from the center of the meniscus. It’s that easy.
What is meniscus in terms of the graduated cylinder?
1. n. [Drilling Fluids] The curved interface between two immiscible phases in a tube, such as in a pipette or graduated cylinder. Liquid volumes should be read at the bottom of a curved meniscus by alignment of the bottom of the meniscus. For water and liquids that wet the glass, the meniscus is concave.
What is a meniscus and explain how it is used to make an accurate measurement in a graduated cylinder?
A convex meniscus happens when the particles of liquid are more attracted to each other than the particles of the container they are in. ( Eg. Mercury in Glass) USGS. In both cases, the accurate measurement is taken by reading the center of the meniscus.
What causes surface tension in water?
The surface tension arises due to cohesive interactions between the molecules in the liquid. At the bulk of the liquid, the molecules have neighboring molecules on each side. Molecules are pulling each other equally in all directions causing a net force of zero.
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.
What is meniscus and its types?
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.
Why does wet glass stick together?
Water wets glass and spreads out on it because the adhesive forces between the liquid and the glass are stronger than the cohesive forces within the water.
Why is the meniscus concave in water quizlet?
In a polar liquid such as water, the concave shape of the meniscus shows that water’s adhesive forces toward the glass are stronger than its cohesive forces.
Which of the following describes why water has a concave or downward curving meniscus?
Solution : In case of water, the adhesive forces in the molecules of glass and water are stronger than the cohesive forces in the water molecules. Therefore, the meniscus of water is concave.
Which of the following properties of liquids explains when a meniscus forms from a liquid in a test tube?
Capillary action is responsible for the concave liquid surface, called a meniscus, that forms in a test tube or graduated cylinder.
What is the meniscus and why is it important?
The meniscus acts as a significant cushion or shock absorber in your knee. A meniscus is a c-shaped disc of soft cartilage that sits between the femur and the tibia. When the meniscus tears that cushioning effect functions poorly, that might lead to arthritis and knee pain.
What is a meniscus Why is it very important in measurement?
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.
Why do we read meniscus at eye level?
The graduated cylinder is calibrated so that reading the bottom of the meniscus, when viewed at eye level, will give accurate results. Viewing the meniscus at any angle other than eye level will give inaccurate results.
What determines the shape of the 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. This occurs with water and a glass tube.
What is a meniscus and how do you use it to accurately measure liquids?
What is a meniscus and how do you use it to accurately measure liquids? the curve of the upper surface of a liquid when it is placed in a column; used to accurately measure liquids by reading the bottom of it.
What is the meniscus of a liquid used for?
A concave surface of a liquid resulting from surface tension. The bottom of the meniscus is used to measure the volume of a liquid in apparatus such as a graduated cylinder.
What is the opposite of meniscus?
We have listed all the opposite words for meniscus alphabetically. line. band. bar. borderline.
What is a meniscus error?
This error is often called a bias in the measurement. In chemistry a teacher tells the student to read the volume of liquid in a graduated cylinder by looking at the meniscus. A student may make an error by reading the volume by looking at the liquid level near the edge of the glass.
What force causes surface tension?
The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension.
What factors affect surface tension?
Surface tension is caused by the effects of intermolecular forces at the interface. Surface tension depends on the nature of the liquid, the surrounding environment and temperature. Liquids where molecules have large attractive intermolecular force will have a large surface tension.
On what factors does surface tension depends?
Surface tension depends mainly upon the forces of attraction between the particles within the given liquid and also upon the gas, solid, or liquid in contact with it. The molecules in a drop of water, for example, attract each other weakly.