Admin What part of meniscus should be read?
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.
Do you read a graduated cylinder at the top of the meniscus?
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.
Do you read a graduated cylinder from the bottom of the meniscus?
Steps to reading Graduated Cylinders: 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. Follow the lowest point at the surface of the water to the wall of the graduated cylinder. Read the volumetric scale at this point.
Why do you read 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.
Do you read mercury at the bottom 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. You won’t be able to take an accurate reading looking up at the liquid level or down into it. Get eye level with the meniscus.
How many medium tick marks mean?
Explanation: To read a graduated cylinder, first determine how much volume is represented by each tick mark. There are 10 tick marks from 20 mL to 40 mL, so each tick mark represents 2 mL. Next, read the volume from the bottom of the meniscus. The bottom of the meniscus is aligned with the tick mark representing 28 mL.