International A Level Biology / Cellular respiration
Core practical 16: the respirometer and RQ revision notes
Edexcel International A Level Biology (YBI11), chapter 20: Cellular respiration, specification point 7.8. Part of the full course.
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A respirometer measures oxygen uptake by tracking the movement of a liquid drop. You can use the gas-volume change to calculate respiration rate and, without soda lime, the respiratory quotient (RQ).