Pub. date: 2008 | Online Pub. Date: April 25, 2008 | DOI: 10.4135/9781412963893 | Print ISBN: 9781412958783 | Online ISBN: 9781412963893| Publisher:SAGE Publications, Inc.About this encyclopedia
Andrew J. Waskey
CARBON DIOXIDE IS a naturally occurring gas. Chemically, it is stated as CO 2 , which means that each carbon dioxide molecule has two oxygen atoms bonded to a single carbon atom. CO 2 has many practical applications. CO 2 measurements are now being used as a way to test the cardiovascular system. This new tool has the promise of not being as invasive as other diagnostic methods. CO 2 can be frozen into dry ice, and has numerous chemical uses. It is often a byproduct from chemical reactions. It has a number of common uses, such as providing the fizz in soft drinks. Humans and other animals also expel CO 2 when they exhale. In the respiratory processes of humans, mammals, birds, reptiles, and fish, oxygen is breathed into the lungs and CO 2 is exhaled. Their breath contributes to the CO 2 cycle. In the CO 2 2 ...