What key characteristics define CNG?

The key characteristics that define Compressed Natural Gas (CNG) include its lighter-than-air property, non-toxic and colorless nature, and the presence of a distinct odor. Being lighter than air means that in the event of a leak, CNG will rise and disperse into the atmosphere rather than accumulating at ground level, which is an important safety consideration. The fact that it is non-toxic indicates that it does not pose a health risk to individuals in the event of exposure, making it a safer alternative compared to some other fuels.

The distinct odor is typically imparted to CNG by the addition of a chemical called mercaptan, which helps detect gas leaks, as CNG itself is odorless. This property is vital for safety, enabling individuals to detect leaks early and take appropriate measures. Thus, the combination of being lighter than air, non-toxic, colorless, and having a distinct odor are defining characteristics that make CNG a preferred fuel choice in various applications.