Gas Introduction
Sulfur hexafluoride is an inorganic compound with the chemical formula SF6. It is a stable gas that is colorless, odorless, non-toxic, and non flammable at room temperature and pressure. Its molecular weight is 146.055, and its density is 6.0886kg/m3 at 20 ℃ and 0.1 MPa, which is about 5 times the density of air. The molecular structure of sulfur hexafluoride is arranged in octahedra, with small bonding distance and high bonding energy. Therefore, its stability is very high. At temperatures not exceeding 180 ℃, its compatibility with electrical structural materials is similar to that of nitrogen gas.
Since the mid-1960s, SF6 has been widely used as an insulation medium for high-voltage electrical equipment. SF6 gas insulated fully enclosed switchgear has a much smaller footprint than conventional open type high-voltage distribution equipment, and its operation is not affected by external weather and environmental conditions. Therefore, it is not only widely used in ultra-high voltage and extra high voltage power systems, but has also begun to be used in distribution networks (SF6 gas insulated switchgear and ring network power supply units). The advantages of SF6 gas insulated pipeline transmission lines are low dielectric loss, large transmission capacity, and the ability to be used in high drop situations. Therefore, they are commonly used for hydropower station outgoing lines, replacing conventional oil filled cables. SF6 gas insulated transformers have the advantages of fire and explosion prevention, and are particularly suitable for power supply in densely populated areas and high-rise buildings. SF6 gas insulated ultra-high voltage transformers have been successfully developed, and fully gas insulated substations will be a direction for the development of substation technology.
Because the density of sulfur hexafluoride is about five times that of air, people who inhale sulfur hexafluoride will emit mechanical waves with longer wavelengths when speaking, making their speech sound more like that of a male. On the other hand, helium gas has the opposite effect, with shorter wavelengths when inhaled, making their speech sound more like that of a female.

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