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.
coal gas-gaseous mixture produced by distillation of bituminous coal and used for heating and lighting. town gas-coal gas manufactured for domestic and industrial use. fuel-a substance that can be consumed to produce energy; more fuel is needed during the winter months; they developed alternative fuels for aircraft.