Final answer:
Oxygen containers, apparatus, and fittings should not be handled with greasy hands to prevent fire or explosion risks, and to avoid contaminating the oxygen which is critical in medical and industrial environments.
Step-by-step explanation:
The question you have asked is related to the safety and handling procedures for oxygen containers, apparatus, and fittings. You should not handle these items with greasy hands. Oil or grease can react with pure oxygen under pressure and may cause fire or an explosion.
It is essential always to handle oxygen equipment with clean, grease-free hands, tools, and materials. It is safer to use clean gloves or tools that are designed to be free from oil and grease when working with oxygen systems. This helps prevent accidents and ensures that the oxygen does not become contaminated which is vital in medical and industrial settings.