Working Principle Of Laboratory Pipettes

The design of micropipettes commonly used in clinical practice is based on Hooke's law: that is, within a certain limit, the length of the spring extension is proportional to the elastic force, that is, the volume of liquid in the pipette is proportional to the spring force in the pipette.
There are two physical principles for micropipette loading: loading with an air cushion and loading with positive displacement of a piston without an air cushion. These two different principles of micropipettes have different specific application ranges.