Definitions

1. noun

A device used to measure the flow rate of a fluid, typically a gas or liquid, by the displacement of a float or a bob in a vertical tube.

“The engineer used a rotameter to measure the gas flow rate in the chemical plant.”

2. noun

A flow meter that works on the principle of variable resistance, with the measured flow causing a change in the resistance of a rotor.

“The rotameter provided an accurate measurement of the oil flow rate during the engine test.”