Why is the meniscus important?
The meniscus plays a vital role in maintaining the stability of the knee joint along with optimizing the tibiofemoral load transfer and distribution. This also helps in preserving the health of the articular cartilage.
What is a meniscus and why is it important?
The meniscus plays two important roles within the knee. A meniscus is a critical shock absorber within the knee. The meniscus also provides stability within the knee.
What is meniscus in measuring cylinder?
Biology Glossary search by EverythingBio.com. 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 a meniscus and how should you measure?
You must get at eye-level with the meniscus to obtain an accurate reading. Pick up the glassware to bring it up to eye level or bend down to take a measurement. 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.
How does the meniscus affect reading the correct volume?
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 should you read volumes at the bottom of a meniscus?
Normally, liquid will curve at the edges of the surface where the liquid touches the container because water molecules are more attracted to glass than to each other. We need to read the level at the bottom of the meniscus to measure a volume of liquid in a graduated cylinder.
How do you read a lower meniscus?
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.
How can we determine the volume of a liquid with a meniscus that curves upwards?
Explanation: When it curves upwards it reveals that the liquid has stronger adhesive force than cohesive force. When meniscus of liquid curves upward in a calibrated container the volume of the liquid is determined by reading the values at the bottom of the curving point.
Why is water’s meniscus 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. A convex meniscus occurs when the molecules have a stronger attraction to each other than to the container, as with mercury and glass.
Why meniscus is formed in graduated cylinder but not in a beaker?
Water molecules are attracted to the molecules in the wall of the glass beaker. And since water molecules like to stick together, when the molecules touching the glass cling to it, other water molecules cling to the molecules touching the glass, forming the meniscus.
What is the shape of the meniscus of the liquid that rises in a capillary tube?
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.
Why does liquid rise in a capillary tube?
The rise of water in a thin tube inserted in water is caused by forces of attraction between the molecules of water and the glass walls and among the molecules of water themselves. The narrower the bore of the capillary tube, the higher the water rises.
Does cohesion cause surface tension?
The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension.
Do all liquids have surface tension?
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. In comparison, organic liquids, such as benzene and alcohols, have lower surface tensions, whereas mercury has a higher surface tension.
What liquid has the strongest surface tension?
Besides mercury, water has the highest surface tension for all liquids, which is due to the hydrogen bonding in water molecules. The surface tension of water causes water molecules at the surface of the liquid (in contact with air) to hold closely together, forming an invisible film.
What liquid has the lowest surface tension?
Hexane
How do you break the surface tension of water?
In order for water to flow more easily into these small spaces, you need to decrease its surface tension. You can do this by adding soap, which is a surfactant (a material that decreases the surface tension of a liquid).
Do you have to break the surface tension of water?
The whole ‘breaking the surface tension’ is a myth. You would splat no matter how many bullets you had. Unless you have a grenade launcher capable of creating vast amounts of gas bubbles in water under you. With a large enough gun, the recoil might slow you enough to save you.
Does salt increase surface tension?
NaCl salts cause an increase of the surface tension and the residence time of interfacial water molecules. They also decrease the residence time of interfacial n-decane molecules.
What would happen if water didn’t have surface tension?
It’s not a simple case of just getting rid of water’s surface tension. No surface tension/ energy would imply no intermolecular interactions and from there all non ideal models of the world fly out the window. There would be no phase transformations; everything would be an ideal gas, absent of molecular interactions.
Why does dish soap break surface tension?
Detergent and Soap Break Surface Tension The end of the detergent molecule which attaches to fat (grease) repels water molecules. This weakens the hydrogen bonds holding the water molecules together at the surface. The result is a break in the surface tension of the water.
What would rain be like without surface tension?
So, strictly literally, if you set all those self-attractive forces (and thus, surface tension) to zero, there is no longer such thing as a liquid at all. A rain droplet undergoing that transition would become a highly compressed gas and explode into the surrounding air.
How does surface tension affect life?
Surface and interfacial tensions are phenomena that affect our everyday life. High surface tension of water is also the reason why rain comes down as a spherical drop. High surface energy drives the water drop to take a shape with as little surface area as possible, making a sphere shape most favorable.
What are the causes of surface tension?
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.
How is surface tension useful for plants and animals?
. surface tension of water helps creatures(mostly of insecta class such as water striders) to walk on water. . it also helps water to move up the xylem tissue of higher plants without breaking up.
What is the importance of surface tension?
Surface tension determines the efficiency of detergent formulation. The high surface tension of water makes it a relatively poor cleaning detergent. By increasing the temperature of water (as is often done when washing clothes or dishes), the cleaning efficiency increases slightly as surface tension decreases.
What is the difference between surface tension and surface energy?
Surface Tension measures the force applied parallel to a surface applied per unit length. Surface energy measures the energy required per unit area to create a new surface.
How do plants rely on surface tension?
The tendency of molecules to stick together is called cohesion, which is stronger for water than for most other liquids. Cohesion is very important in plants. Trees depend on cohesion to help transport water from their roots to their leaves. Plants rely on the surface tension to transport water inside themselves.
How does surface tension help a plant?
Surface tension is responsible for the shape of water drops and for holding the structures together as plants soak up the water. Water molecules form hydrogen bonds with each other to give them a sticky quality allowing them to form drops.