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Water Facts and Figures Water in Numbers Total volume of water on Earth Of which the volume that is seawater Frozen in polar ice caps Atmospheric moisture In the bodies of living things 344 million cubic miles 315 million cubic miles 7 million cubic miles 4,000 cubic miles 3400 cubic miles Water in the Body About 66% of your body is water The average adult body contains 37 litres of water Blood is 83% water The brain is 75% water Bones are 25% water Water and Health You need to drink about 2 litres of water every day Humans consume about 75,000 litres of water in a lifetime A person could live for a month without food but only a week without water A quarter of the world’s population does not have safe drinking water Water can cause serious health damage when it is contaminated by bacteria and other micro-organisms Water in Use It takes 27,000 litres of water to grow a day’s food for a family of four It takes 5,680 litres of water to process one barrel of beer To manufacture a new car takes 148,000 litres of water Americans use five times the amount of water that Europeans use A five-minute shower can use 95 litres of water