sulphur hexafluoride

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An inert compound of sulphur and fluorine, which was employed as a useful dielectric, i.e. insulator. In gaseous form it is an exceptionally powerful greenhouse gas (24 000 times as effective at absorbing infrared radiation as carbon dioxide), with a lifetime of 3 200 years, and as such is being phased out under the Kyoto Protocol.

Subjects: Environmental Science.

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