Alcohol has the effect of sterilization, physical antipyretic, prevention of bed sores, according to the alcohol concentration, its use is also different. Medical alcohol can be categorized into 30%, 40~50%, 75% and 95%. Although the concentration is different, their main component is ethanol. 1.30% alcohol is mainly used for physical cooling of fever, but it should be noted that children, alcohol allergy, etc. can not adapt to this method of cooling. 2.40~50% alcohol is mainly used for the prevention of bedsores, the usage is to pour the alcohol into the hands and massage the pressurized parts, which can play a preventive effect. 3.75% alcohol, 75% concentration of alcohol can be used for skin and body surface disinfection, or tableware and hand disinfection, but can not be used for mucous membranes and large wounds. 4.95% alcohol, mainly used for the sterilization of medical equipment. Alcohol can denature proteins and make bacteria inactive, so as to kill bacteria, if the concentration of alcohol is too high, the effect of sterilization will also be weakened.