funnel , or also known as pear decantanción is a glass element generally found in laboratories and is used for the separation of liquid phases of different density. In the upper sector it has a mouth with a plug through which its interior is loaded. On the other hand, in the lower sector it has a stopcock, which allows to regulate or cut off the flow of liquid through the tube at its lower end.

The most common shape that these types of funnels have is the conical shape, or also known as the inverted pear shape, with the stopcock in the narrowest part. In addition, there are separatory funnels with a cylindrical or straight shape.  In all the types that exist, they have a frusto-conical section to allow their closure with the cap, which can be plastic or glass.

It is an instrument specifically for separating immiscible liquids, which are separated by different densities and molecular properties through a totally differentiated interface.

An example can be; If you want to separate a certain amount of an oil-water emulsion, it must be loaded into a separatory funnel, which after standing long enough for a clear separation of the two substances to appear, can be separated into two fractions. For this process, the lower spigot is opened and the denser liquid falls, and when it is seen that the interface of the two liquids is approaching the valve, the flow is cut off. In this way, the collected water is kept in a container, and the oil in the decanting pear.

Samantha Robson
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Dr. Samantha Robson ( CRN: 0510146-5) is a nutritionist and website content reviewer related to her area of ​​expertise. With a postgraduate degree in Nutrition from The University of Arizona, she is a specialist in Sports Nutrition from Oxford University and is also a member of the International Society of Sports Nutrition.

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