Why does water flow?
Water surrounds us everywhere: at work, on vacation, on the street, in the apartment.
Human life originates in water and organisma person consists of 90% of the liquid. Therefore, water is a vital element. We are so used to her presence that we do not even think about how and why water flows.
The flow of water in nature
The principle of the water cycle in nature is still knownfrom school. Water falls to the ground from above in the form of rain, snow, hail, and, evaporating, slowly returns to the sky and accumulates in the clouds. Due to such cyclic movements, the amount of water on the planet remains unchanged. But why rivers flow? What moves the flow of water in the seas and oceans?
The flow of rivers
The water in the river is in constant motion: from turbulent to invisible to the naked eye. This phenomenon is explained by the elementary laws of physics.
Each small stream and a huge river havebeginning and the end. The source of the river can serve as a lake, an underground source or another pond. Water resource, which flows into the river, is called the mouth. Between the source and the mouth can lie thousands of kilometers. Since the source is always above the level of the mouth, water, according to the law of terrestrial gravity, flows down due to its fluidity.
The flow of water in the seas and oceans
There are several reasons for the movement of water in the world's oceans.
- cosmic - the rotation of the Earth, the moon tides;
- difference in water densities - difference in temperature and salinity;
- wind - cause the occurrence of currents in the entire depth of the ocean.
Why does tap water flow?
Raise the water upwards against the law of attractionto use for their own purposes, the ancient Romans also tried, using aqueducts. Now the pumping of water into the cranes of our apartments is carried out with the help of pumps and is a laborious process.
The water intake is made through a pipe laid indepth of the pond. At its end is a grill for filtering algae and large debris. From the pipe, water is pumped into special settling tanks, where it is cleaned of sand, clay and silt. After primary purification, water is supplied for decontamination to the pools in which it is filtered, chlorinated and ozonized.
Ready-to-use water pumps are pumped to a water distribution station, and from there through pipes - to consumers' taps.