BEAKER

APPEARANCE

Generally cylindrical in shape with a flat bottom and a lip or a pout.

Commonly made of glass (today usually borosilicate glass ), but can also be in metal 

(such as stainless steel or aluminium) or certain plastics (notably polythene, polypropylene, PTFE). 

Available in a wide range of size. 10Ml up to 5 L.

Beakers are often graduated,

that is,

marked on the side with lines indicating the volume contained.

For instance, 

a 250 mL beaker might be marked with lines to indicate 50, 100, 150, 200, and 250 mL of volume. 

These marks are not intended for obtaining a precise measurement of volume (a graduated cylinder or a volumetric flask would be a more appropriate instrument for such a task), but rather an estimation.

HOW TO USE IT

The use of the beaker is to hold and pour liquids. They can also be used to heat liquids.

Hold

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NOTE

Standard or "Low-form" beakers typically have a height about 1.4 times the diameter.

The common low form with a spout has been called the Griffin form (A).

These are the most universal character and are used for various purposes

- from preparing solutions and decanting supernatant fluids to simple reactions.

"Tall-form" (B) beakers have a height about twice the diameter.

These are sometimes called Berzelius beakers. 

They are mostly used for titration.

Flat beakers (C) are often called crystallizers,

because most are used to perform crystallization, 

but often it is also used as a vessel for use in hot-bath heating. 

These beakers usually do not have a flat scale.

A beaker is distinguished from a flask by having sides which are straight rather than sloping.

The exception to this definition is a slightly conical sided beaker called a Phillips beaker.

REFERENCES

1. ^ Oxford English Dictionary 1989 edition
2. ^ ^{a b c} British Standard 6523 (1984) Glass beakers for laboratory use
3. ^ A. I. Vogel (1974) Practical Organic Chemistry Third edition (Longman, London) page 46 ISBN 0 582 44245 1
4. ASTM E960 - 93 (2008) Standard Specification for Laboratory Glass Beakers

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