Respiration experiment

Respiration experiment

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Credit: TREVOR CLIFFORD PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

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Caption: Respiration experiment. Person breathing into tubing connected to test tubes containing lime water (calcium hydroxide solution). Carbon dioxide (CO2) passed into limewater produces a milky suspension of calcium carbonate. As there is a high percentage of carbon dioxide in exhaled air, inhaled air leaves the lime water clear (right), but exhaled air turns it milky (left).

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Keywords: adult, air, apparatus, breathing, calcium carbonate, calcium hydroxide, carbon dioxide, caucasian, chemical, chemistry, device, equipment, exhaled, exhaling, experiment, experimenting, human, lime water, limewater, one person, people, reacting, reaction, respiration, science education, solution, solutions, suspension, test tube, tube, tubes, tubing, white

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