katharometer
noun
ka·tha·rom·e·ter
ˌka-thə-ˈräm-ət-ər 
: an apparatus for determining the composition of a gas mixture by measuring thermal conductivity that has been used to determine the basal metabolic rate by measuring the rate of production of carbon dioxide based on the composition of expired air
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“Katharometer.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/katharometer. Accessed 30 Nov. 2025.
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