Measuring Cylinder

Measuring Cylinder

https://en.wikipedia.org/wiki/Graduated_cylinder

A graduated cylinder, also known as measuring cylinder is a common piece of laboratory equipment. It is used to measure the volume of a liquid. It has a narrow cylindrical shape. Each marked line on the graduated cylinder represents the amount of liquid that has been measured.

The Measuring Cylinder is available in:

• 10 ml (0.2ml)
• 25 ml (0.5ml)
• 50 ml (1.0ml)
• 100 ml (1.0ml)
• 250 ml (2.0ml)
• 500 ml (5.0ml)
• 1000 ml (10.0ml)

Measuring:

To read the volume accurately, the observation must be at an eye level and read at the bottom of a meniscus.  The main reason as to why the reading of the volume is done via meniscus is due to the nature of the liquid in a closed surrounded space. By nature, liquid in the cylinder would be attracted to the wall around it through molecular forces. This forces the liquid surface to develop either a convex or concave shape. That depends on the type of the liquid in the cylinder. Reading the liquid at the bottom part of a concave or the top part of the convex liquid is equivalent to reading the liquid at its meniscus.