It is a measure of the tendency of a liquid fuel to produce carbon particles known as soot. Generally, it is measured by burning fuel in a special wick lamp in which the flame height is increased slowly till it starts producing smoke. The maximum height in term of millimeters of smokeless flame at which flame starts smoking is termed as smoke point. Hence, higher the smoke point, lower will be the tendency of the fuel to smoke.
Smoke point is related with the aromatic content of the liquid and it is inversely proportional to the aromatic content. Smoke point is used to determination of smoking tendency. Smoking tendency is proportional to the aromatic content.