ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Carbon dioxide. Molecular model of carbon dioxide, CO2. The black sphere represents an atom of carbon. Red spheres represent oxygen. The atoms in this linear molecule are held together by two double bonds, each involving a shared pair of electrons. Carbon dioxide is a colourless gas at room temperature. It comprises 0.3-0.4% of the atmosphere and is a waste product of animal and plant respiration. It is produced commercially from furnace gases, fermentation processes, from the reaction of carbonates with acids and the reaction of steam with natural gas. Carbon dioxide is used in mineral water, as a refrigerant ('dry ice'), as an inert gas and as a fire extinguisher.
Model release not required. Property release not required.