In order for a state of fluid balance to be achieved, obligatory water loss must equal facultative water loss.

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Obligatory water loss refers to the minimum amount of water the body must excrete to remove waste, while facultative water loss is the additional water excreted based on fluid intake. Fluid balance is achieved when total water intake equals total water loss, not just when obligatory equals facultative loss.

In Order for a State of Fluid Balance to Be