What is a Pipette and Its Characteristics

the pipette It is a graduated glass tube used to transport liquid from small portions of liquid from one container to another.

The pipette is a laboratory instrument of different types such as the graduated pipette, the volumetric pipette, the micropipette, among others. Similarly, the different styles of pipettes have as characteristics: transparent tube, widened in its middle part and conical in shape at the bottom. In addition, the upper orifice of the pipettes is covered so that the atmospheric pressure makes it impossible for the liquid to come out.

The main function of the pipette is to measure the aliquot of a liquid quite accurately.. The pipettes have scales in ml through the tube, which is visible due to its transparency, allowing the liquid to be observed and the scale indicating different volumes.

In the same way, together with the pipette, the propipette is used, it is a laboratory instrument that allows the liquid to be sucked and, in this way, to transfer all kinds of liquids from one container to another. However, the suction bulb which has the same function as the propipette can also be used. The function of both tools is to prevent poisonous, toxic, corrosive or vapor-emitting liquids from being sucked into the mouth.

Types of pipettes

Volumetric or volumetric pipette

Volumetric or volumetric pipette It is characterized by measuring a single volume. Volumetric pipettes can be single or double gauging. In reference to the volumetric pipettes of simple capacity, the solution is loaded up to the mark of the upper capacity and with caution the entire volume of the liquid is allowed to flow, in turn, the volumetric pipettes of double capacity are specified by filling the pipette with the solution up to the upper capacity and then the liquid is allowed to drain to the lower capacity.

See also Capacity.

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Graduated pipette

graduated pipettes they are identified and differentiated from volumetric pipettes by measuring various volumes according to the capacity of the pipette, so it can measure maximum and minimum volumes with less precision than volumetric pipettes.

Pasteur pipette

Pasteur pipette, known as a leak, its name is due to the chemist Louis Pasteur. Pasteur pipettes are tubes with a conical edge, their main function is to transfer small amounts of liquids.


micropipettes They are used to measure liquids of low density, approximately between 1 to 500 microliter.