
thumb thumb|TecFluid-CG34-2500 for water flow measurement thumb|Medical oxygen regulator with rotameter thumb|Multi-gas flowmeter A rotameter is a device that measures the volumetric flow rate of fluid in a closed tube.
thumb thumb|TecFluid-CG34-2500 for water flow measurement thumb|Medical oxygen regulator with rotameter thumb|Multi-gas flowmeter A rotameter is a device that measures the volumetric flow rate of fluid in a closed tube.
It belongs to a class of meters called variable-area flowmeters, which measure flow rate by allowing the cross-sectional area the fluid travels through to vary, causing a measurable effect.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).