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.
How do you read a meniscus level?
Read Meniscus at Eye Level – YouTube
What is a 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 •
How is meniscus water measured?
Measure so that the line you are reading is even with the center of the meniscus. For water and most liquids, this is the bottom of the meniscus. For mercury, take the measurement from the top of the meniscus. In either case, you are measuring based on the center of the meniscus.
Why is it important to read the water level from the bottom of the meniscus?
The meniscus make accurate reading of the level very difficult but it only affects the surface near the sides of the container. The bulk of the surface is away from the sides so reading the level from the bottom minimises the likely error.
What is meniscus in measuring cylinder?
When a liquid is placed into a graduated cylinder, the surface takes on a curved shape. This curve is known as a meniscus. The graduated cylinder is calibrated so that reading the bottom of the meniscus, when viewed at eye level, will give accurate results.
What is upper meniscus?
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.
What causes meniscus?
Any activity that causes you to forcefully twist or rotate your knee, especially when putting your full weight on it, can lead to a torn meniscus. Each of your knees has two C-shaped pieces of cartilage that act like a cushion between your shinbone and your thighbone.
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.
What is the meniscus of mercury?
Water has an upward meniscus, mercury has a downward meniscus.
How do you read a test tube?
How to Read a Graduated Cylinder – YouTube
Does a meniscus tear cause fluid on the knee?
Secondary effects. A torn meniscus often causes the knee to make extra joint fluid. There is more room in the knee for fluid when the knee is slightly bent. Therefore, people with chronic swelling tend to hold the involved knee in a bent position and develop hamstring tightness and joint contracture.
How do you read glassware?
How To Read Graduated Glassware – YouTube
What happens if you read above the meniscus?
Looking from above the liquid would produce an inaccurate measurement, which in baking can be quite disastrous. … This is the upward or downward curve at the surface of a liquid in a container. A meniscus occurs because of surface tension.
Why is it necessary that the eye should be at the same level as the bottom of the meniscus when reading the level of the liquid in a graduated cylinder?
Your eye must be on the same level as the bottom of the meniscus to read the volume correctly. The meniscus formed by a non-wetting liquid, such as mercury (Hg), is convex with the highest point in the center. In the case of a convex meniscus, the highest point is used to make the reading.
Where do you need to orient your eye level to take an accurate reading of the meniscus?
The water in a cylinder will form a curve called the meniscus 3. Your eye should be level with the top of the liquid 4. Find the bottom of the curved meniscus in the water. This should be in the center of the graduated cylinder.
What are the types of meniscus?
Each knee has two menisci: The lateral meniscus is in your outer knee, and the medial meniscus is in the inner knee. A torn meniscus is a primary reason for knee pain, because the injured cartilage is no longer providing the full cushiony protection between the bones in the knee joint.
How do you read graduated cylinder?
Reading a Graduated Cylinder
Place the graduated cylinder on a flat surface and view the height of the liquid in the cylinder with your eyes directly level with the liquid. The liquid will tend to curve downward. This curve is called the meniscus. Always read the measurement at the bottom of the meniscus.
What is meniscus quizlet?
Meniscus. The curve at the surface of a liquid.
Which meniscus is read for Colourless liquid?
During lab experiments especially in chemistry, we are always told to take a reading at bottom of the meniscus for colourless liquids and the upper meniscus of coloured liquids.
Do meniscus tears heal?
In the case of meniscus tears, some people think the injury will heal over time on its own. But the truth is that there are different types of meniscus tears — and some tears won’t heal without treatment. If your tear is on the outer one-third of the meniscus, it may heal on its own or be repaired surgically.
Where is meniscus pain?
Symptoms of a meniscus tear may be different for each person, but some of the most common symptoms are: Pain in the knee joint: usually on the inside (medial), outside (lateral) or back of the knee. Swelling. Catching or locking of the knee joint.
Is a meniscus tear painful?
Like a lot of knee injuries, a meniscus tear can be painful and debilitating. Unfortunately, it’s quite common. In fact, a meniscal tear is one of the most frequently occurring cartilage injuries of the knee.
Where do you read the meniscus inside a graduated cylinder?
To correctly read a graduated cylinder, the surface at the center of the meniscus must be read, not the top of the ring of liquid clinging to the wall of the graduated cylinder. For most liquids, this “center” will be the lowest point of the meniscus.
Which meniscus is read in Coloured and Colourless solutions give reason?
In case of colorless liquid it is easy to observe the phase boundary, wether it is convex or concave hence in colorless liquids upper or lower meniscus may be considered. However in case of colored liquids observing this phase boundary is not possible, hence only upper meniscus is considered.
Does the ocean have a meniscus?
Absolutely! From Wikipedia: 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 .
Why is the meniscus of water different from mercury?
Mercury shows a convex meniscus (the centre is higher than the edges), because internal cohesive forces are stronger than the force between the glass wall and the metal. In contrast, water exhibits a concave meniscus, because the attraction between the wall and the water is stronger than the water’s internal cohesion.
Why is mercury cohesive?
As mercury is a metal, the bonds between the molecules are metal bonds that are much stronger than the hydrogen bonds leading to very high cohesive forces and high surface tension.
Which unit is biggest?
Kilometers are the longest unit of metric measurement.
How many mL is a test tube?
The small 13x100mm borosilicate glass test tubes are 100 mm tall x 13 mm with 11 mm inside diameter. Volume is approximately 9 ml.
How do you calculate test tube capacity?
Fill Inner diameter of tube together with Length of tube and hit the Calculate button to calculate and display it in Volume field. Hit reset button to clear the fields. The Volume field is calculated from the formula: Volume (V) in ml = (diameter * diameter * Pi * Length) /4000.
What happens if a meniscus tear is left untreated?
An untreated meniscus tear can result in the frayed edge getting caught in the joint, causing pain and swelling. It can also result in long term knee problems such as arthritis and other soft tissue damage.
Will walking on a torn meniscus make it worse?
Can you walk on a torn meniscus? Whether you can walk on a torn meniscus will depend on the injury’s location and severity — and perhaps also your own personal tolerance for pain. A slight tear might not feel so bad to you. You may very well be able to stand and walk on a leg that has a torn meniscus in the knee.
What is a Grade 3 meniscus tear?
Meniscus tears, indicated by MRI, are classified in three grades. Grades 1 and 2 are not considered serious. They may not even be apparent with an arthroscopic examination. Grade 3 is a true meniscus tear and an arthroscope is close to 100 percent accurate in diagnosing this tear.
Is graduated cylinder TD or TC?
Graduated cylinders are calibrated either “to contain” (indicated liquid volume inside the cylinder) and marked as “TC” or “to deliver” (indicated liquid volume poured out, accounting for liquid traces left in the cylinder) and marked “TD”.
What is the least count of 100 mL measuring cylinder?
Answer: 1 ml will be the least count.
What is the difference between TD and TC pipette?
A pipette is either calibrated to “TC” or “TD” and abbreviations are normally printed on the side or bulb of the pipette. … Most typical graduated pipettes or bulb pipettes are usually calibrated to deliver (TD), whereas capillary pipettes are adjusted to contain (TC).
Where do you read the meniscus?
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 angle should you be when you are reading a cylinder or Buret?
Buret Reading – YouTube