Photograph of a physicist monitoring a complex experiment using a closed respirometer. A respirometer is a general term that encompasses a number of techniques for obtaining estimates of the rates of metabolism of vertebrates, invertebrates, plants, tissues, cells, or microorganisms via an indirect measure of heat production. Dated 20th Century

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
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Keywords: 20th, archival, archive, cells, century, closed, experiment, experimental, heat, historical, history, human, invertebrates, measure, metabolism, microorganisms, photograph, photography, physicist, physics, plants, respirometer, science, scientific, subject, test, testing, tissues, vertebrates