2 Sentences With "let air out"

How to use let air out in a sentence? Find typical usage patterns (collocations)/phrases/context for "let air out" and check conjugation/comparative form for "let air out". Mastering all the usages of "let air out" from sentence examples published by news publications.

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When the pipette knob is pressed on an air displacement pipette, the piston inside the instrument moves down to let air out. Air is displaced by the piston. The volume of air displaced is equivalent to the volume of liquid aspirated. These pipettes are capable of being very precise and accurate.
Air from the tip rises to fill the space left vacant, and the tip air is then replaced by the liquid, which is drawn up into the tip and thus available for transport and dispensing elsewhere. When the pipette knob is pressed on an air displacement pipette, the piston inside the instrument moves down to let air out. Air is displaced by the piston. The volume of air displaced is equivalent to the volume of liquid aspirated.