As used in this chapter:
1. "Dealer" means any person in the business of handling liquefied petroleum gas who delivers or sells any liquefied petroleum gas to any retail dealer or user of liquefied petroleum gas.
2. "Liquefied petroleum gas" includes any material that is composed predominantly of any of the following hydrocarbons or mixtures of the following hydrocarbons: propane, propylene, butanes (normal butane and isobutane), and butylenes.