75% alcohol does not need to be mixed with water, alcohol is divided into 75% and 95%. The alcohol used to disinfect skin, surgery, and objects is 75% alcohol, which is a solution or disinfectant that can coagulate and kill microorganisms such as viruses or bacteria. If you want to go below this concentration, it no longer has a disinfection effect. 95% alcohol is not used for medical purposes, but for lighting alcohol lamps or for scientific research, when it needs to be mixed with water. Therefore, only 95% alcohol needs to be mixed with water and diluted, 75% alcohol does not need to be mixed with water and diluted.