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A pipette (sometimes spelled as pipet) is a type of laboratory tool commonly used in chemistry and biology to transport a measured volume of liquid, often as a media dispenser. 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 ...
(These are for Class A pipettes; Class B pipettes are given a tolerance of twice that for the corresponding Class A.) A specialized example of a volumetric pipette is the microfluid pipette (capable of dispensing as little as 10 μL) designed with a circulating liquid tip that generates a self-confining volume in front of its outlet channels. [3]
A Mohr pipette is designed for use as a drain-out pipette. It has a straight tube and graduation marks indicating 0.10 millilitres (0.0035 imp fl oz; 0.0034 US fl oz) changes volume. This type of pipette does not have its first (lowest) graduation mark until well past the base of the tip.
Move the pipette to the receiving vessel and dispense the liquid by gently pressing the pipette knob to the first stop. After about one second, keep on pressing pipette knob to the second stop. This action will completely empty the tip from the liquid. Afterwards withdraw the tip from the liquid and release the pipette to the ready position.
Repeaters are specialized pipettes, optimized for repeated working steps like dispensing several times a specific volume like 20 μL from a single aspiration of a larger volume. In general, they have specific tips which do not fit on normal pipettes. Some electronic pipettes are able to perform this function using standard tips.
Experiment using two tuning forks oscillating at the same frequency.One of the forks is being hit with a rubberized mallet. Although the first tuning fork hasn't been hit, the other fork is visibly excited due to the oscillation caused by the periodic change in the pressure and density of the air by hitting the other fork, creating an acoustic resonance between the forks.