Speaker
Piimonpun Prasongsri
(Department of Physics and Material Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand; Physics Education Research Laboratory, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand)
Description
This study aimed to investigate thermodynamic properties of a rubber balloon including hysteresis and cooling effect of a deflated balloon. Firstly, pressure inside a balloon was measured using a Vernier pressure sensor and plotted as a function of the balloon averaged radius. Well-known mathematical models of inflated balloon including Mooney-Rivlin, Ogden and Gent-Gent models were used to fit experimental data. Secondly, hysteresis of pressure-stretch curve was investigated and it was found to depend on a turnaround radius. Thirdly, surface temperature of the balloon was investigated by using a Vernier surface temperature sensor. As a result when the balloon was deflated, temperature could decrease more than 5ºC depending on the initial radius and balloon thickness. These results can be used to develop teaching materials or demonstrations for an introductory or advanced thermodynamics course.
Author
Piimonpun Prasongsri
(Department of Physics and Material Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand; Physics Education Research Laboratory, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand)
Co-author
Pornrat Wattanakasiwich
(Department of Physics and Material Science, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand; Physics Education Research Laboratory, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand)
