Why are chain links often used to secure gas cylinders?

Using chain links to secure gas cylinders primarily serves the purpose of preventing them from falling, which helps to reduce the risk of damage or accidents. Gas cylinders are heavy and can pose significant safety hazards if they are allowed to topple over. When secured properly with chains, the cylinders are stabilized and less likely to become dislodged by accidental bumps or during transport. This safety measure is vital in environments where gas cylinders are frequently moved or used, ensuring that they remain upright and minimizing the potential for injuries or leaks that could result from a cylinder falling.

The other choices outline concepts that do not align with the primary safety purpose of securing gas cylinders. While aesthetics may be a consideration in some contexts, the main goal is safety. Identification of gas types is typically done through labeling, and quick access may be facilitated in other ways that do not compromise safety.