I want to know the answer to the following question:
When are these useful?
All the background I'm provided with is that "These properties may be useful when hydrogen is purified by passage through hot palladium disks, but the gas's high solubility is a metallurgical problem, contributing to the embrittlement of many metals, complicating the design of pipelines and storage tanks.". Is that enough to answer the question?
Answer: yes