Whenever the following words are used in this article, they shall have the respective meanings as follows:
A liquid with a flash point at or above 100° F. to include Class II and Class III liquids such as but not limited to heating fuel and kerosene.
A gas which is customarily used for burning with air to produce heat, including but not limited to liquefied petroleum gas, natural gas, propane and butane.
A liquid with a flash point below 100° F. to include Class I liquids such as but not limited to gasoline, alcohol and turpentine.
The temperature at which the liquid gives off vapor sufficient to form an ignitible mixture with the air.