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Questions for Dr. Kennedy
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Water content of the human body
Posted by: Joe
Date: January 10, 2002 2:46 AM

If in early adulthood the human body consists of 65 % water, is this by volume or weight? Also, how many gallons of water actually is in the human body in early adulthood?



Edited 3 time(s). Last edit at October 4, 2007 2:56 AM by Dr. Kennedy.

RE: Water content of human body
Posted by: Ron Kennedy, M.D.
Date: January 10, 2002 6:44 AM

Since the body is very close to the density of water, sometimes more sometimes less depending on the percentage of body fat, and since 65-70% is an estimate, I think you could say either one. Let's say we examine an approximately 150 pound, better yet an exactly 70 kg. adult whose overall specific gravity = 1.0, exactly equal to warer. One cc of water weighs one gram, therefore 70 kg. x 0.65 = 45.5 kg. of water. As there are 2.2 pounds in a kilo this comes out to 100.1 pounds of water. As one gallon water weighs 8.33 pounds, that comes to almost exactly 12 gallons of water in a 70 kg. (150 pound) person.



Edited 3 time(s). Last edit at October 4, 2007 2:54 AM by Dr. Kennedy.



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