Does anyone know how to measure body fat % underwater?

[Padfoot]

http://hans.fugal.net/density/density.pdf

Under paragraph 2, they explain how you can hold a milk jug underwater to find out your body density. I don't understand the equation they use; where does 1.3L come from? And I don't understand overall how this equation works, why is the volume of the jug subtracted?


If anyone could help that would be awesome

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[bee17]

1.3 L is close to the average residual volume of the human lung. Even after you force all the air you possibly can out of your lungs, some air remains.

 

[Padfoot]

1.3 L is close to the average residual volume of the human lung. Even after you force all the air you possibly can out of your lungs, some air remains.

Thanks, I don't get the equation though, like why is the volume of the buoy taken away from the volume of the body