Alternatively, it is straight-walled, and graduated for different volumes such as 5 mL in 0.5 mL increments. One type has a large bulb, and is calibrated for a single volume. It is more commonly used in chemistry, with aqueous solutions. Pipettes that dispense between μl are termed micropipettes, while macropipettes dispense a greater volume of liquid. A pipette works by creating a vacuum above the liquid-holding chamber and selectively releasing this vacuum to draw up and dispense liquid. Pipettes come in several designs for various purposes with differing levels of accuracy and precision, from single piece glass pipettes to more complex adjustable or electronic pipettes. Pipettes are commonly used in chemistry and molecular biology research as well as medical tests. 3 Piston-driven air displacement pipettes.
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