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.
A gas meter is a specialized flow meter, used to measure the volume of fuel gases such as natural gas and propane.Gas meters are used at residential, commercial, and industrial buildings that consume fuel gas supplied by a gas utility.everal different designs of gas meters are in common use, depending on the volumetric flow rate of gas to be measured, the range of flows anticipated, the type of gas being measured and other factors.