about water in human body
of water in human body
Like all living tissues, our body contains water in various amounts:
- 75% for a baby
- 70% for one child
- 60% for an adult
( diagram: percentage of water
in human body )
water in human body ?
Previous percentages can be used to calculate the amount of water in a
- A baby whose mass is 3 kg:
3 x 75 : 100 = 2,25 kg
This baby has 2,25 kg of water in its body ( it corresponds to 2,25 L )
A child whose mass is 40 kg:
40 x 70 : 100 = 28 kg
This child has 28 kg of water in its body ( it corresponds to 28 L )
An adult whose mass is 70 kg:
70 x 60 : 100 = 42 kg
This adult has 42 kg of water in its body ( it corresponds to 42 L )
How human body loses water ?
The water in our body is eliminated in three ways:
- By the urine (approximately 1 L per day)
- By sweating (about 0.5 L per day)
- By breathing which rejects water vapor (about 0.5 L per day)
Water balance in the body
To maintain a stable percentage of water in the body and avoid
dehydration, lost water must be replaced:
Therefore in total 2L of water must be consumed per day: 1.5 from
drinks and the balance being provided by food.
Learn more about water in human
: more detail
about percentage of water in various parts of human body and factors
that may affect it.
water may affect healt in various ways
: article from scientific
american that explain water should not be consummed with excess.
Water losses of the human body and how to
compensate for them:
Various factors that may cause losses of water and how to balance them