A simple experiment on global warming
A simple experiment has been developed to demonstrate the global warming potential of carbon dioxide (CO 2 ) gas in the Earth's atmosphere. A miniature electric resistance heating element was placed inside an inflatable balloon. The balloon was filled with either air or CO 2 . Whereas the CO 2 partial pressure on the earth's atmosphere is approximately 4 × 10 −4 atm, in this experiment, a high partial pressure of CO 2 (1 atm) was used to compensate for the short radiation absorption path in the balloon. The element was heated to approximately 50°C, the power was then switched off and the element's cooling trends in air and in CO 2 were monitored. It took a longer time to cool the heating element back to ambient temperature in CO 2 than in air. It also took longer times to cool the element in larger size balloons and in pressurized balloons when they were filled with CO 2 . To the contrary, the balloon size or pressure made no difference when the balloons were filled with air. A simple mathematical model was developed, and it confirmed that the radiative heat loss from the element decreased significantly in CO 2 . This investigation showed that the cooling rate of an object, with surface temperature akin to temperatures found on Earth, is reduced in a CO 2 -rich atmosphere because of the concomitant lower heat loss to its environment.