Natural gas, LPG, gasoline, naphtha, kerosene, diesel fuel, fuel oils, lubricating oils, asphalt, tar, and petroleum coke are different products derived from petroleum. The aniline point, flash point, fire point, smoke point, cloud point, pour point, freezing point, viscosity, vapor pressure, API, acid value/number, octane number, calorific value, specific gravity, and emulsification are key properties of petroleum products that are measured using various apparatus to detect characteristics like flammability, flowability, and energy content.