Can we feel water in the air

Do we breathe out water vapor?

After it became clear that we were exhaling carbon dioxide, my son discovered that we were exhaling more than just carbon dioxide. Because when he breathes on his hands, they suddenly feel wetter. "Why do we breathe out water vapor?" was the logical question.

Humans consist of up to 70% water. That's a lot of water! The younger we are, the more water we even have in us.

There is water in the lungs too. When we breathe air into the lungs, water automatically passes into the air (liquid always gives off vapor to air). So the air we breathe out is more humid than the air we breathe in. It therefore contains more water vapor and therefore feels more humid. This is even more noticeable in winter when we breathe on cold window panes.

We lose at least one glass of water every day through exhalation. Of course we have to drink that again, because our body needs the water.

Why do humans need water at all? What does the human body do with water?

Water is important because important substances that occur in the body dissolve in water:

  1. Nutrients that are required in different parts of the body and are transported there via the water-containing / liquid blood
  2. Waste materials that the body does not need and which may even be dangerous and can therefore be excreted with the Pippi.

By the way, the human body loses water in the following ways:

  • as Pippi (that's the largest share)
  • over the skin in the form of sweating
  • on exhaling
  • and a small part about the "Kacki".

This water loss has to be compensated for every day by drinking.

If we drink enough, the so-called important water balance of the human body is secured.

Incidentally, the human body regulates excessively high temperatures through sweating. If we e.g. B. If we have a fever and the body is threatened with too much heat, we sweat. Sweating means that water is building up on the skin. When this evaporates, the body cools down.

(The House of Little Researchers is presenting a nice experiment on so-called evaporative cooling this month as part of the monthly experiment "May": "Mini fridge self-made".

Related entries: