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What is the dielectric strength of Sulphur hexafluoride used in SF6 type circuit breaker?

What is the dielectric strength of Sulphur hexafluoride used in SF6 type circuit breaker? Correct Answer 2.5 times of air

The dielectric strength of Sulphur hexafluoride used in SF6 type circuit breaker is 2.5 times that of air. Sulphur hexafluoride has excellent physical, chemical and arc quenching properties. Also it acts as very good insulator that is why it is used in the SF6 type circuit breakers.

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In circuit breaker, to facilitate arc quenching, dielectric strength can be increased by
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