There are a variety of pipette types that use a partial vacuum earlier mentioned the liquid-holding chamber to draw up and distribute the liquid, after which selectively release this vacuum. Instruments have various levels of measurement precision. Pasteur pipettes with rubber bulbs attached. Pasteur pipettes are plastic or glass pipettes https://andreslklir.ttblogs.com/8926070/not-known-facts-about-types-of-glass-pipette