Oil comes in many forms that differ from each other in their behaviour. The difference is defined under 3 main headings , Viscosity, Volatility, and Toxicity.
Viscosity refers to an oil resistance to flow.
Volatility refers to how quickly the oil evaporates (into the air).
Toxicity refers the poisonous elements of oil and how it can adversely affect the environment.
Oil is classified into groups that outline their behaviour and persistence.Knowing the behaviour of the oil helps determine its effects on the environment and how to appreciate a clean -up.