The measurement of air flow in a forced expiration using a pressure-sensitive transistor.
D000669:Amplifiers, Electronic; D005540:Forced Expiratory Flow Rates / Q000295:instrumentation*; D006801:Humans; D008176:Lung Volume Measurements; D011312:Pressure; D012666:Semiconductors; D014159:Transducers; D014173:Transistors, Electronic