The cardinal principle of fluid balance is that it can be maintained only if intake equals output of fluid.
Fluid balance is a component of homeostasis in which an organism must regulate its water balance through osmoregulation and behavior in order to maintain healthy levels of electrolytes (salts in solution) in all of its bodily fluids.
The fundamental rule of fluid cardinal balance is that the body's output (through respiration, perspiration, urine, faeces, and expectoration) must equal the intake.
For instance, in humans, the output (via respiration, perspiration, urination, faeces, and expectoration) must match the intake (via eating and drinking, or by parenteral intake).
The law of water balance fundamentally asserts that the amount of water entering any system or area must equal the amount leaving it, plus any changes in storage over time.
A water balance equation in hydrology can be used to explain how water enters and exits a system.
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