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.
Seealso the entry for pyrolysis.Producer gas A gas mixture containing carbon monoxide (CO),hydrogen (H 2), carbon dioxide (CO 2) and nitrogen(N 2). In the USA, producer gas is a generic termreferring to wood gas, town gas, synthesis gas,syngas or raw gas.