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Dec 19, 2017

Grease is a general term for oil and fats. In terms of chemical composition, fats are esters of high fatty acids and glycerol. Oil is a derivative of hydrocarbons. Grease is a special ester. Oil in nature is a mixture of many substances, the main ingredient of which is a molecule of glycerol and three molecules of advanced fatty acid dehydration of the ester, called triglycerides.

The main physiological function of oil is to store and supply heat energy, which can provide more energy in metabolism than carbohydrate and protein. When a gram of grease is completely oxidized in vivo, it can produce about 39,800 kj of heat.

Among them, oil is unsaturated high fatty acid glycerol ester, fat is saturated high fatty acid glycerol ester, are high fatty acid glycerol ester, is an organic matter. Vegetable oil at ambient temperature and pressure generally for liquid, called oil, and animal fats at ambient temperature and pressure under the solid state, called fat. Grease is a mixture, no fixed melting point. Grease is not only one of the main nutrients and main food of human, but also an important industrial material.