A lean man, for example, has about 42 (42-47) liters of water in his body.

The total body of water is divided into fluid compartments, between the intracellular fluid compartment (also called space, or volume) and the extracellular fluid (ECF) compartment (space, volume) in a two-to-one ratio: 28 (28-32) liters are inside cells and 14 (14-15) liters are outside cells.

The ECF compartment is divided

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