Basics

A Chemical used to add a scent to various Compressed Gasses (Typically Methane or Propane / LPG )
Thus when there is a leak one can detect the smell and respond accordingly
Various Compounds Are Used, but the main ones are:
- Methanethiol (Common in Methane (aka "Natural Gas" ; CNG ) )
- Ethanethiol (Common in Propane / LPG )
  - The Following can also be used (or blended with eachother and/or the odorants listed above)
    - Dimethyl Sulfide
    - Isopropyl Mercaptan (aka Isopropanethiol )
    - Methyl Ethyl Sulfide
    - Normal Propyl Mercaptan (aka Propanethiol )
    - Secondary Butyl Mercaptan (aka 2-Butanethiol )
    - Tertiary Butyl Mercaptan (aka tert-Butylthiol )
    - Tetrahydrothiophene

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