What is "odorizer"

n. A device to add odor to a gas.

An odorizer is a device that adds an odorant to a gas. The most common type is one that adds a mercaptan liquid into natural gas distribution systems so that leaks can be readily detected. Other types have been used for carbon dioxide fire extinguishers.

A major spur to the development of gas odorants and odorizers was the March 18, 1937 natural gas leak that blew up a school in New London, Texas, killing 294 children and teachers.