Utah Code Title 72. Transportation Code § 72-7-111. Storage of flammable, explosive, or combustible materials prohibited

(a) “Combustible” means a material capable of producing a usually rapid chemical process that creates heat and usually light.

(b) “Explosive” means any chemical compound mixture, or device, the primary or common purpose of which is to function by explosion.

(c) “Flammable” means a material capable of being easily ignited and burning quickly.