Without water there would be no life on earth. People, animals and plants need – not only for the metabolism, for many plants and animals it is also important habitat. Last but not least we need water to Wash, and to make electricity out of it. Here are the answers to twelve frequent questions asked by children on the theme of water.
Why is the water wet?
If we immerse the Hand into the water, the small particles that make up water, the molecules stick to the skin. We feel the wet.
Why freeze it when you come out of the water?
water on the skin evaporates into the air. For this it needs heat. This is removed from the body. When you Evaporate the water gets colder. Therefore, we freeze when we get out of the warm bath. Even more, we are freezing and wet in the fresh air, or if there are winds, because then the water from the skin removes heat even faster.
How does the salt get into the sea?
When it rains and the rain water seeps through the earth, minerals are washed out of the Sand and stones out. Including very little salt is always. The water is then discharged into rivers that flush again, salt and other minerals from the soil. The rivers flow eventually into the sea, and salt comes together enough so you can taste it on the tongue.
Why can't you drink sea water?
The salt in sea water would dehydrate the body. This is because the salt absorbed must be excreted via the kidneys. For this process the body needs water more than he has taken with the sea water.
Why freeze water?
water is made up of small Parts, the molecules. If the water is warm, they are lively and constantly moving – water is a liquid. It is colder, the particles always, stick together and form crystals. These make the water hard and solid it will turn to ice.
Why does it hurt when you do in the Badi "Ränzler"?
Actually, the water feels soft. This is because the small particles in the water, the molecules have to Dodge our body, when we slowly descend into the water. In the case of a jump, but you have no time to do this and stay close to each other as a surface. The larger the area is that the water bounces, the more painful.
warning, danger: the greater the impact surface, the "harder" the landing. Photo:
How can you make water flow?
When water falls through pipes or tunnels in the depth, it has plenty of power, in a power plant, a Turbine. This looks similar to a ship's propeller. A Generator is connected. This is a device that can turn the kinetic energy of the Turbine to electrical energy, i.e. electricity.
How fish can breathe under water?
We take the oxygen you Breathe from the air, the fish out of the water. For this to work, the fish have no lungs, but gills. The skin flaps on the head. When the fish open the mouth, flows into the water. If you close the mouth, out flows the water at the gills, where the oxygen is filtered out and into the blood.
Why can't you run over the water?
Very easy creatures such as the water Strider or things, such as, for example, a leaf can stay on the water, because the molecules of water stick together. This is called surface tension. For larger Weights, such as that of a human, this voltage is not enough, we sink or swim.
How high is a spring injected well?
The highest fountain splashes over 300 meters high. It is the King Fahd's Fountain in Jidda on the Red sea. In Switzerland, one of the highest water fountain in Geneva, in lake Geneva. The Jet d'eau sprays 140 feet high.
Why are your fingers wrinkled if you stay long in the water?
On the fingers and the feet, we have thicker skin than the rest of the body. If we are long in the water, can these skin cells with water and swell, and the skin is shriveled.
Why sink ships?
ships are hollow on the inside, and displace a lot of water, pushing it, so to speak, set aside, as you can watch in the bath. As the water rises, if you put. The water particles do not make but would like to place that press against the ship and keep it that way on the surface. This is called buoyancy. This is not always as great as the weight of the fluid displaced by a body or object. A large ship displaces a lot of water, and contains in the cavities of the air, so it weighs less than the water it displaces. It can swim only if it displaces more water than it weighs.
(the Swiss family)
Created: 09.04.2019, 16:33 PM