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Fuel gases are very combustible and can easily explode. Explosions can occur when a gas leaks from its container and reaches an ignition source, such as an open flame or spark. In the United States, many changes have been made to prevent gas explosions. The addition of odorizes to fuel gases is one of them . An odorizer adds strong odor, or smell, to feel gas. Therefore, fuel gas leak happens, the strong odor helps individuals in the area detect it in time to prevent an explosion.