A burette is a vertical cylindrical piece of laboratory glassware with a volumetric graduation on its full length and a precision tap, or stopcock, on the bottom. It is used to dispense known amounts of a liquid reagent in experiments for which such precision is necessary, such as a titration experiment. Burettes measure from the top since they are used to measure liquids dispensed out the bottom. The difference between starting and final volume is the amount dispensed.
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Pipettes
A pipette is a laboratory instrument used to transport a measured volume of liquid. Pipettes are commonly used in molecular biology as well as medical tests. 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. They are usually used to transfer or extract small amounts of liquid.
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Measuring Cylinders
A measuring cylinder is a piece of laboratory equipment used to accurately measure the volume of an object. Water displacement can be used to find out the volume of an object. Graduated cylinders are generally more accurate and precise for this purpose than flasks and beakers. Measuring cylinders are usually made of transparent materials such as polypropylene and polymethylpentene.
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Done by: Kimberly Kiong
3/4/2010
