Structure
Standard or "Low-form" beakers typically have a height about 1.4 times the diameter. The common low form with a spout was devised by John Joseph Griffin and is therefore sometimes called a Griffin beaker. 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.
Read more about this topic: Beaker (glassware)
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—Karl Wilhelm Von Humboldt (1767–1835)
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