Hazardous Materials Identification System. The Hazardous Materials Identification System (HMIS) is a numerical hazard rating that incorporates the use of labels with color developed by the American Coatings Association as a compliance aid for the OSHA Hazard Communication Standard. 1 HMIS Color Bar.
Definition of greenhouse gas. : any of various gaseous compounds (such as carbon dioxide) that absorb infrared radiation, trap heat in the atmosphere, and contribute to the greenhouse effect.
A greenhouse gas (GHG) is any gas in the atmosphere that takes in (absorbs) and gives off (emits) radiation in the heat (infrared) wavelength range. Greenhouse gases cause the greenhouse effect, which results in increased temperatures on Earth.ut greenhouse gases in the atmosphere absorb some of the infrared radiation energy and âtrapâ it in the lower atmosphere. Less heat radiates into space, and the Earth is warmer. Many greenhouse gases occur naturally. Carbon dioxide, methane, water vapor, and nitrous oxide are naturally present in Earthâs atmosphere.