It is necessary and important for every creature living on the Earth to breathe. The oxygen, nitrogen and some other gases are mixed together and the mixture may be breathed. The air is also contributed to the water's formation. Moreover, the air is used today by people in their daily activities such as making cleaning fluids, diluting the accumulator's acid, producing medicines, diluting vinegar and alcohol, to producing glues or other lacquers. Thanks to the air we may drink tea with sugar, salt our meals and the sea water is salt. Moreover, we may feel various scents. This is a particular kind of diffusion which is called osmosis and the osmosis causes that the oxygen and water may penetrate our blood and all tissues. It nourishes them and makes them stronger. In the same way the products of metabolic rate are excreted. The phenomena of the various substances may bring also the negative consequences such as sea or river pollution.
What are the superficial tension and the capillarity?
It is consisted of a kind of pellicle laying on the liquid surface. The light objects such as the light coin may be put on the water surface and it will flow. This phenomenon is very convenient of water birds such as ducks or swans. The water insects may slide on the surface. It was discovered that the superficial tension will be smaller when there are some chemical substances dissolved in the water. It is used to clean up, wash up and wash.
Intermolecular interaction
Without the intermolecular interaction life on our plant wouldn't be probably possible. In means of the molecules coherence all liquids, gases and solids don't derive from each other. As best example may be mentioned the water and many other objects surround us. Thanks to the differences between the two forces: the coherence and adhesion the water animals don't soak.
Those phenomena mentioned above are used in gluing, painting, lacquering and in many others activities. Thanks to the force of coherence we may use the cosmetics and write. They also protect living organisms by keeping substances such as fat and sugar on the body's surface which are helpful in preventing from drying and freezing.
