Abstract Based on the digital experiment of handheld technology, this paper provides a novel and efficient method for the theme experiment of “investigating changes in inhalation and exhalation gas composition” in junior high school chemistry, and explores the changes in inhalation and exhalation gas composition under different physical activity states. This paper integrates oxygen, carbon dioxide, and water vapor sensors to design two experimental setups, the aim is to gain a deeper understanding of how physical activity states influence the composition of respiratory gases. Experimental results show that the concentration of carbon dioxide and water vapor in exhaled gas increases while the concentration of oxygen decreases after rest and physical activity, and the difference in gas concentration comes from the difference in oxygen consumption of different physical activity.
LEI Yu-Hao, QIAN Yang-Yi, ZHENG Yan-Xian, WEN Jin-Ju, LIU Ying-Tong, CHEN Jun-Ming. Investigating Changes in Inhalation and Exhalation Gas Composition in Different Physical Activity States Based on Handheld Technology[J]. Chinese Journal of Chemical Education, 2024, 45(19): 68-73.
