"Rotameter" Natural Recordings by Native Speakers
A rotameter is a type of flow meter that measures the flow rate of a fluid (liquid or gas) in a pipe by detecting the movement of a float trapped in a tube of tapered or conical cross-section. As the fluid flows through the tube, the float rises or falls in response to the flow rate and remains vertically centered when the flow rate is steady. The position of the float, usually indicated on a calibrated scale, directly correlates with the flow rate, allowing the operator to determine the flow rate of the fluid.