Buna is a census-designated place in Jasper County, Texas, United States. The population was 2,142 at the 2010 census.
Gas Exchange. Gas exchange is the process by which oxygen and carbon dioxide (the respiratory gases) move in opposite directions across an organism's respiratory membranes, between the air or water of the external environment and the body fluids of the internal environment.
Producer gas is a mixture of flammable and nonflammable gases, mainly carbon monoxide and hydrogen in the former, and carbon dioxide and nitrogen for the latter. It burns with a lower heat than some other gases, but its great benefit is that it can be manufactured simply and relatively cheaply.