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In modern technology, fuel cells are successfully used as sources of electric current. In them, at a fairly low temperature, the chemical form of energy is converted into electrical energy, and the current arises from the chemical interaction of flammable substances - hydrogen, gasoline, diesel fuel, coal, ammonia, metals with different...

We often hear today about the damaging ultraviolet rays, ozone and ozone holes. What is ozone, which is very dangerous and at the same time extremely necessary for all living things on planet Earth? In nature, ozone occurs in the stratosphere at an altitude of 15-30 km from molecular oxygen under the influence of ultraviolet rays...

In physics, accelerators have long been used. To have a reaction between the particles, they must be stocked with energy. To do this, the physicist accelerates them in the electromagnetic field of the accelerator. Thus, the molecules could not be accelerated, since they are electrically neutral and the electromagnetic field does not act on them...

Delhi column, located in the courtyard of the minaret Kutub-Minar, always surprises travelers who visited the old part of Delhi. According to Indian scientists, it is almost one thousand six hundred years old, since it was erected in 415 AD. The weight of the column is 6500 kg, the height is 7,3 m, the diameter of the base is 41,6 cm. But the Delhi column...

The aluminothermy was discovered by N. N. Beketov in 1859. As a method of producing iron, manganese, chromium, tungsten, vanadium, rubidium, lithium, calcium, barium, aluminothermy is of great practical importance. It is also used to produce some alloys, for welding rails...

The thought of K.E. Tsiolkovsky about the settlement of people around the sun, when it seemed too fantastic. But the man left his cradle - the Earth long ago and took the first step to create a cosmic civilization, which, above all, needs materials. In space, metals, acids, alkalis, oxidants will be needed. They will have to be cooked differently than on Earth, but by special technology. Therefore, the problem of space exploration forces us to develop new areas of science and technology - space technologies...