The water is heavy. Wine is a mixture of alcohol and water. The density of water is greater than that of alcohol. The density of water is 1 g/cm3, and that of alcohol is generally 0.8 g/cm3. Water is an inorganic substance composed of hydrogen and oxygen, which is nontoxic and drinkable. At normal temperature and pressure, it is a colorless and odorless transparent liquid, which is called the source of human life. Water is one of the most common substances on earth. 72% of the earth's surface is covered with water. It is an important resource for all life, including inorganic compounds and human beings, and it is also the most important component of organisms.