How is the gas flow indicated in a flowmeter?

The indication of gas flow in a flowmeter is accurately represented by the height of an indicator within the cylinder. This device typically consists of a tapered glass or plastic tube with a float that rises and falls based on the flow of gas. As the flow of gas enters the flowmeter, it pushes the float up to a specific level in the tube. The height to which the float rises directly correlates to the rate of gas flow, which can then be read against a scale printed on the side of the flowmeter.

This method of measurement is practical and visually intuitive, allowing anesthetists or healthcare providers to quickly assess and adjust gas flow rates during procedures. By relying on the position of a physical indicator within a cylinder rather than on electronic or auditory signals, flowmeters provide a reliable and straightforward means to monitor gas flow in real-time.