What is the most common way to measure end tidal gas concentrations on our anaesthetic machines?

What is the most common way to measure end tidal gas concentrations on our anaesthetic machines?

What is the most common way to measure end tidal gas concentrations on our anaesthetic machines?









A: mass spectrometry
B: Raman scattering
C: ultrasonic
D: infrared
E: piezoelectric











Answer:  B