Anesthesia Physics and Equipment made easy !
WHAT IS FLOW !
Flow is the quantity of material passing a given area in a unit time period.
Look at the pipe below with water flowing past a given area (the red line).

In this pipe, quantity of 300 mL of water has passed the given area after a time period of one minute.
Saying it in another way, the flow in the above pipe is 300 mL per minute.


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