Used primarily as an odorant in natural gas and liquefied petroleum gas (LPG) due to its strong, unpleasant smell. This application allows for quick detection of gas leaks, enhancing safety in residential, commercial, and industrial settings. It is effective at very low concentrations, making it ideal for trace addition to otherwise odorless fuel gases. Also used in some chemical synthesis processes as a reagent or intermediate, particularly in the production of pesticides, pharmaceuticals, and specialty organic compounds. Its reactivity as a thiol makes it useful in certain catalytic and polymerization reactions.