Sulfur hexafluoride (SF 6It is an inorganic , colorless, odorless and nonflammable greenhouse gas . SF 6consists of six fluorine atoms bound in a central sulfur . Hypervalent molecule. Normally the solubility in water is low for a gas without pole , but it can be dissolved in non-polar organic solutions. It is usually carried as a liquefied gas. At sea level the density is 6,12 kg / m³. This is much higher than the air density (1,225 kg / m³). Applications 8,000 tons of SF 6 in a yearProduced. Most of this (about 6,000 tons) is used to create insulating media in the electrical industry. There are also other use environments. Isolating media SF6is used to create insulating media in high voltage breakers . SF 6, Pressure under an insulator is used. Because the resistance to insulation is higher than air or dry nitrogen . In this way, the electrical arc that is generated during the switching on / off is completed in a shorter time. Thickening of human voice This is due to the fact that the sound moves more slowly in sulfur hexafluoride. The reason for this is that the velocity of the sound in the gases is inversely proportional to the square root of the density of the gas. Because sulfur hexafluoride is much more dense than air, the rate of sound in sulfur hexafluoride is several times higher than in the air. Due to the vibrations of the sound with sulfur hexafluoride instead of air, and the sound slower in the sulfur hexafluoride, the human voice comes out in a way. The sulfur hexafluoride, which is removed, loses its effect after this reproduction. Similarly, in the case of breathing helium gas , which is inert and nontoxic , this time the human voice becomes high, because this gas is much less dense than the air, and therefore the sound progresses much faster than the air in helium.

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