Why do you measure from the bottom of the meniscus?
The location of the mark on the glass is where the bottom of the meniscus should be in order to have the "true" volume be what's marked. So by measuring from the bottom of the meniscus, you're synchronizing your measurement procedure with the procedure of the people who originally calibrated the markings on the glass.
How do you read meniscus correctly?
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.
Where do you measure the water's meniscus?
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.
How do you read a meniscus in 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 happens if you read the meniscus below eye level?
0:050:32Read Meniscus at Eye Level - YouTubeYouTubeStart of suggested clipEnd of suggested clipLevel when the eyes are above the level of the meniscus. The value read is less than the levelMoreLevel when the eyes are above the level of the meniscus. The value read is less than the level reading when the eyes are below the level of the meniscus. The value read is more than the level.
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.
How do you read upper and 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. It's that easy.
What is meniscus in surface tension?
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.
What is the meniscus?
The meniscus is a C-shaped piece of tough, rubbery cartilage that acts as a shock absorber between the shinbone and the thighbone. It can be torn if you suddenly twist your knee while bearing weight on it. A torn meniscus is one of the most common knee injuries.
What is meniscus in measuring cylinder?
The Meniscus When observing a volume of a liquid in a graduated cylinder, graduated pipette, or buret, read the point on the graduated scale that coincides with the bottom of the curved surface of the liquid. The curved surface of the liquid is called the meniscus.
How do you read the colorless and colored meniscus?
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.
What is the meniscus and why is it important?
Every structure in the knee joint is important and the menisci are the bulwark against the destruction of the joint. The menisci of the knee joint are fibrocartilaginous semilunar tissues that perform the critical functions of stabilizing the joint and aiding in efficient load transfer as a shock absorber.
How do you read the colorless and colored meniscus?
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.
Where do you read the meniscus inside a graduated cylinder quizlet?
The meniscus must be read consistently from the top of the graduated cylinder.
How to get accurate reading of meniscus?
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.
What is the meniscus of a liquid?
What is Meniscus? 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.
What is a concave meniscus?
A concave meniscus occurs when the molecules of liquid are strongly attracted to the container wall rather than to each other. In that case, liquid appears to ‘stick’ from the edges forming a concave shape.
Why are liquids so difficult to measure?
Liquids are difficult to measure with the naked eye due to surface tensions causing a meniscus to form on the circumference of the measuring object.
Is water a convex or concave meniscus?
Most liquids, including water, show a concave meniscus but a great example of a convex meniscus is liquid mercury in a glass container. It is to be noted that in some cases, the meniscus appears in a straight line instead of any curvature at all. For example, water in some plastic cylinders. No meniscus makes measuring very easy.
When you read a scale on the side of a container with a meniscus, such as a graduated?
When you read a scale on the side of a container with a meniscus, such as a graduated cylinder or volumetric flask , it is important that the measurement accounts for the meniscus, and take this advice to heart.
Where does the word "meniscus" come from?
Did you know that the word meniscus comes from the Greek word for crescent? This makes good sense, considering the shape of a meniscus. And should you be wondering what the plural of meniscus is, it is menisci!
What is the meniscus in chemistry?
According to about.com, the meniscus is the curve seen at the top of a liquid in response to its container . The meniscus can be either concave or convex, depending on the surface tension ...
What is the difference between a concave and a convex meniscus?
The meniscus can be either concave or convex, depending on the surface tension of the liquid and adhesion to the wall of the container. A concave meniscus occurs when the molecules of the liquid are more strongly attracted to the container than to each other. The liquid appears to “stick” to the edge of the container.
Where to measure mercury?
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 centre of the meniscus.
What is a meniscus?
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.
Why a meniscus occurs
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.
Sad tale of a meniscus misread
Few people take the time to consider the importance of water menisci in their lives. But, imagine this chilling scenario:
What is the best way to detect a torn meniscus?
MRI. This uses radio waves and a strong magnetic field to produce detailed images of both hard and soft tissues within your knee. It's the best imaging study to detect a torn meniscus.
How to tell if a meniscus is torn?
A torn meniscus often can be identified during a physical exam. Your doctor might move your knee and leg into different positions, watch you walk and ask you to squat to help pinpoint the cause of your signs and symptoms.
What to do after meniscus surgery?
After surgery, you will need to do exercises to increase and maintain knee strength and stability. If you have advanced, degenerative arthritis, your doctor might recommend a knee replacement.
How does a knee splint work?
The device contains a light and a small camera, which transmits an enlarged image of the inside of your knee onto a monitor. If necessary, surgical instruments can be inserted through the arthroscope or through additional small incisions in your knee to trim or repair the tear.
How to help knee pain?
Ice can reduce knee pain and swelling. Use a cold pack, a bag of frozen vegetables or a towel filled with ice cubes for about 15 minutes at a time, keeping your knee elevated .
How to strengthen knees?
Physical therapy can help you strengthen the muscles around your knee and in your legs to help stabilize and support the knee joint.
Can you have surgery for a knee tear?
Many other tears that aren't associated with locking or a block to knee motion will become less painful over time, so they also don't require surgery. Your doctor might recommend: Rest. Avoid activities that aggravate your knee pain, especially any activity that causes you to twist, rotate or pivot your knee.
