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Density of SF6 is?
2 times
6 times
5 times
5 times
5 times
Sulfur Hexafluoride (SF6тАЛ) is a heavy, inert, insulating gas widely used in high-voltage circuit breakers and switchgear. Its density is approximately 5 times that of air at standard temperature and pressure.
Sulfur Hexafluoride (SF6тАЛ) is a heavy, inert, insulating gas widely used in high-voltage circuit breakers and switchgear. Its density is approximately 5 times that of air at standard temperature and pressure.
╧БgasтАЛ=RTPMтАЛ тАФ Ideal gas law used to calculate density based on molar mass M
The high density of SF6тАЛ is attributed to its high molecular weight (approximately 146 g/mol) compared to the average molecular weight of air (approximately 29 g/mol). This heavy molecular structure allows SF6тАЛ to provide superior dielectric strength and excellent arc-quenching capabilities by effectively absorbing free electrons in the plasma region during switching operations.
Molecular weight of SF6тАЛ is 146.06 g/mol.
Molecular weight of Air is approx 28.97 g/mol.
Ratio: 146.06/28.97тЙИ5.04.
It is a non-toxic, electronegative gas at room temperature.
High dielectric strength (2-3 times that of air at same pressure)
Excellent arc quenching properties
Chemically stable and non-flammable
High global warming potential if leaked
Decomposition products (like SO2тАЛF2тАЛ) can be toxic or corrosive under arc conditions
Gas Insulated Switchgear (GIS)
High-voltage circuit breakers
Gas-insulated transformers
At atmospheric pressure, SF6тАЛ is about 5.1 times denser than air.
Other options provided are incorrect as they do not reflect the physical property of the molecule's mass ratio.
C is correct тАФ The density of SF6тАЛ is approximately 5 times the density of air due to its high molecular weight.
Remember that SF6тАЛ is an electronegative gas; this means it captures free electrons to form heavy negative ions, which is the primary mechanism for its superior arc-quenching performance in circuit breakers.