Compressed gas containers should not be used for what purpose?

Using compressed gas containers for grounding is inappropriate because these containers are designed specifically to hold gases under pressure, not to serve as electrical conductors or grounding mechanisms. Grounding typically involves connecting a conductive object to the earth to avoid electrical hazards, and this can create safety risks. Compressed gas containers may become damaged or compromised if improperly used in this way, which could lead to the release of gas, posing serious hazards.

In contrast, while the other uses listed may have their own risks or limitations, they pertain more to improper storage or handling rather than a fundamental misuse of the container's intended function. For example, the storage of liquids in compressed gas containers can lead to issues with pressure increase and potential explosions, while using them for structural support or transporting solids could also result in physical damage and safety hazards. However, the grounding of a compressed gas container is distinctly and primarily a misuse of its design and purpose.