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Smelling salts are a chemical compound that releases small amounts of ammonia gas, which essentially jump starts your bodyâs nervous system. The ammonia causes blood vessels in your nasal passages to expand providing an instant increase in oxygen to your brain meaning an instantaneous boost of alertness and power.
Ammonia gas is colorless and has a sharp, intensely irritating smell. Ammonium ions do not have characteristic smells; however, ammonium salts when in aqueous solution, with slow dissociation give odors characteristic of ammonia.