What type of oil is No. 4 fuel classified as?

No. 4 fuel oil is classified as a hydrocarbon oil. This designation refers to its chemical composition, which consists primarily of hydrocarbon molecules derived from petroleum refining processes. Hydrocarbon oils are typically used in industrial applications, including heating and power generation, due to their efficiency and energy content.

In contrast, cooking oil, vegetable oil, and animal fat are not classified as hydrocarbon oils. Cooking oil and vegetable oil are derived from plants, while animal fat comes from animal sources. These oils have different properties and applications, primarily in food preparation and cooking, rather than industrial heating or fuel purposes. Understanding the classification of fuels, particularly in the context of oil burners, is essential for safe and efficient operation.