Abstract
THERE is no doubt that Dr. Roberts has discovered the true explanation of the phenomena that puzzled me and a good many others to whom I showed them. I have repeated Dr. Roberts's method of heating the enveloping material so as to expel all moisture from it, cooling it down to the temperature of the room and then breathing through it. In every case where I did so the thermometer showed a rise to 112° and upwards at the end of a minute; at the end of two minutes the index was pushed into the small bulb at the top, showing a temperature of about 116°. It is evident, therefore, that the high temperature observed is not the actual temperature of the breath, but is caused by the caloric evolved by the transition of the aqueous vapour of the breath into the liquid or solid form.
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DUDGEON, R. Temperature of the Breath. Nature 23, 76–77 (1880). https://doi.org/10.1038/023076d0
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DOI: https://doi.org/10.1038/023076d0
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