How much water are humans made out of?
The average adult is 57 to 60 percent water. Infants average 75 to 78 percent up to their first birthday.
Up to 60% of the human adult body is water. According to H.H. Mitchell, Journal of Biological Chemistry 158, the brain and heart are composed of 73% water, and the lungs are about 83% water. The skin contains 64% water, muscles and kidneys are 79%, and even the bones are watery: 31%.
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