This instrument is based on the principle of
Correct Answer: Henry's law
Description: This is based on Henry's law which states that when a volatile chemical (ethanol) is dissolved in a liquid (blood) and is brought to equilibrium with air (alveolar breath), there is a fixed ratio between the concentration of the volatile compound (ethanol) in air (alveolar breath) and its concentration in the liquid (blood), and the ratio is constant at a given temperature. Correlation between the breath and blood level, and the ratio is generally 2100 : 1.
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Forensic Medicine
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