1. The gases are: air, sulfur hexafluoride gas, perfluorocarbon gas.

2. The invention aims to develop the sulfur hexafluoride gas controllable multi-pass ball valve group.

3. Method, principles for sulfur hexafluoride waste water treatment, process condition experiments and industrial production by calcium oxide is reviewed.

4. With sulfur hexafluoride gas to double as insulation interrupter and circuit breaker.

5. Sulfur hexafluoride (SF6) recovery device is mainly used to recovery, treat and fill the gas of circuit breaker when repairing or maintaining is undertaken.

6. The usage of sulfur dioxide and sulfur hexafluoride gases are greatly reduced[sentence dictionary], thus reducing the pollution caused by sulfur dioxide and sulfur hexafluoride gases to the environment.

7. Using metal plasticity forming theory, by the technology calculation of sulfur hexafluoride breaker shell flanging, a technology calculation method was introduced about pre-punching flanging.

8. This paper refers to the preparation and purification methods of sulfur hexafluoride: direct chemical combination, electrolysis, absorption, and adsorption.

9. The EPA said its finding was based on a rigorous review of science on six greenhouse gases: carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons and sulfur hexafluoride.

10. It can be used for interlayer isolation of gas or oil insulation system, especially interlayer insulation and turn-to-turn insulation of sulfur hexafluoride mutual inductors and transformers.

11. For applications where middle frequency acoustic performance is critical (e. g. speech), insulating glass units can benefit from being filled with sulfur hexafluoride (SF6) gas mixtures.