Definitions for "COMPRESSED NATURAL GAS"
Keywords:  cng, methane, cleanest, lpg, onboard
Natural gas (methane) that has been compressed to a higher pressure gaseous state by a compressor; used in CNG vehicles.
CNG for short. A type of compressed gas used as fuel for stoves and heaters and as an alternative fuel for motor vehicles. CNG is considered safer than other types of fuel such as propane (LPG) because it is lighter than air and may rise into the sky in the event of a leak. It is also considered one of cleanest because of low hydrocarbon emissions and its vapors are relatively non-ozone producing. However, it does emit a significant quantity of nitrogen oxides.
CNG for short. A type of compressed gas used as fuel for stoves and heaters. CNG is stored in metal cylinders prior to use. CNG is considered safer than other types of fuel such as propane (LPG) because it is lighter than air and may rise into the sky in the event of a leak. Caution should still be used as CNG can collect near the cabin ceiling, potentially causing an explosion. Propane is available in more areas around the world than CNG so CNG is not often used outside of North America.