Oil
Oil, oil is a flammable material that can be obtained from plants, minerals, etc. and does not mix with water. In some cases, liquid oil and solid oil are distinguished at room temperature. Uses can be divided into edible, fuel, lubricant, and industrial. Vegetable oil, fish oil, etc. contain a lot of unsaturated fatty acids, and fat of solid meat at room temperature contains a lot of saturated fatty acids. These two are collectively referred to as maintenance. Unsaturated fatty acids have a double or triple bond in the carbon chain, and there are omega-3s such as alpha-linolenic acid, DHA and EPA. Linoleic acid,? -linolenic acid, and arachidonic acid. There are Omega 9 as oleic acid. Saturated fatty acids include palmitic acid and stearic acid, which do not have double bonds or triple bonds in the carbon chain. Volatile essential oils refined from plants are distinguished from oils that lightly float in water, but not oils that do not contain fatty acids.