How is the density of SF6 gas related to its purity in breakers?

The density of a gas refers to its mass per unit volume, which is a fundamental property of all substances in gas form. In the context of SF6 (sulfur hexafluoride) gas used in circuit breakers, understanding this relationship is crucial.

Since density is defined as the ratio of mass to volume, knowing that SF6 gas has a specific mass allows you to determine its density based on the volume it occupies at a given temperature and pressure. This property is significant when assessing the effectiveness and safety of gas-insulated switchgear, as the desired insulating properties depend on the gas's density being within specific parameters.

Other options may confuse the correlations between density, temperature, purity, and molecular weight, but they do not capture the essence of how density is calculated or its straightforward definition. Recognizing that density is directly tied to the mass per unit volume aids in understanding how variations in gas composition or environmental conditions can influence the operational functionality of equipment using SF6.