2.2.1 Where an approximate volume is required

Where accuracy is not essential you will generally use a measuring cylinder (Figure 3), having a volume scale etched into the glass, or a dispenser (Figure 4). The latter fits onto a container of liquid and is used for the repeated delivery of known volumes.

Figure 3 A selection of measuring cylinders

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A photograph of various measuring cylinders of assorted shape and capacity.

Figure 3 A selection of measuring cylinders

Figure 4 A dispenser being used to deliver a known volume of liquid

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A photograph of dispenser being used to deliver a known volume of liquid. The volume adjustment knob

Figure 4 A dispenser being used to deliver a known volume of liquid

In addition, the humble Pasteur pipette (Figure 5) is probably one of the most commonly used items in the laboratory. These are used for the transfer of liquids (often dropwise) where accuracy is not required.

Figure 5 A Pasteur pipette

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A photograph of a Pasteur pipette being used to transfer some blue liquid from an Erlenmeyer flask.

Figure 5 A Pasteur pipette