i.e. from -25 to +50°C.
The volumetric specific heat of this gas is also high. It is around 3.7 times more than that of air and that is why this gas has also tremendous cooling effect in electrical equipment. The thermal conductivity of this gas is not very high it is even lower than air. Still it is quite suitable for cooling effect in circuit breaker. It is because, during dissociation of sulphur hexafluoride molecules around the electric arc, this molecules absorb high amount of heat. This heat is then released when the molecules reform at the periphery of the arc. This process helps to transfer heat from hot season to cool season very rapidly