The single most abundant chemical substance of the body, accounting for 60% to 80% of body weight, is water.
Water is the most important constitutive chemical element of the human body and in a healthy adult it can represent almost 60% of the total body weight.
Thus, in a person weighing about 70 kg, the total body water represents about 40 liters.
In the newborn for example, water represents 75% of the total body weight and then there is a reduction in this tendency with the development and growth of the child.
Water can be considered distributed in two large compartments:
Therefore, we can conclude that 60% to 80% of human body weight is water, which is distributed in the intracellular fluid and in the extracellular fluid.
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