equivalent methane in air
121Fertilizer — Tennessee Valley Authority: Results of Fertilizer demonstration 1942 …
122Formaldehyde — For other uses, see Formaldehyde (disambiguation). Formaldehyde …
123Grisou — Le grisou (le mot vient de grégeois) est un gaz naturel qui se dégage des couches de charbon et des terrains encaissants. Très redoutées des mineurs, les explosions causées par ce gaz, appelées coups de grisou, ont causé de nombreuses victimes.… …
124coal — coalless, adj. /kohl/, n. 1. a black or dark brown combustible mineral substance consisting of carbonized vegetable matter, used as a fuel. Cf. anthracite, bituminous coal, lignite. 2. a piece of glowing, charred, or burned wood or other… …
125United States emission standards — In the United States, emissions standards are managed on a national level by the Environmental Protection Agency (EPA). State and local governments play a subsidiary role. Contents 1 Motor vehicles 1.1 Light duty vehicles 1.1.1 Phase 1 1994 1999 …
126Hydrogen — This article is about the chemistry of hydrogen. For the physics of atomic hydrogen, see Hydrogen atom. For other meanings, see Hydrogen (disambiguation). ← hydrogen → helium …
127Ozone depletion — Image of the largest Antarctic ozone hole ever recorded (September 2006) Ozone depletion describes two distinct but related phenomena observed since the late 1970s: a steady decline of about 4% per decade in the total volume of ozone in Earth s… …
128Liquefied petroleum gas — (also called LPG, GPL, LP Gas, or liquid propane gas) is a flammable mixture of hydrocarbon gases used as a fuel in heating appliances and vehicles. It is increasingly used as an aerosol propellant and a refrigerant, replacing chlorofluorocarbons …
