Which two features help in recognizing a cryogenic cylinder?

The correct answer highlights key characteristics of cryogenic cylinders that are essential for their identification and use.

Cryogenic cylinders are specifically designed to store gases at extremely low temperatures, and their construction reflects this specialized role. The inclusion of a small protective ring at the top is intended to safeguard the valve and connection points from damage, which is especially crucial given the sensitive nature of cryogenic materials. The fact that these cylinders are made of steel is also significant; steel provides the necessary strength and durability to withstand the high pressures associated with cryogenic gases, while also ensuring structural integrity under extreme temperature conditions.

Understanding these features is vital for safe handling and application of cryogenic cylinders in various settings, including laboratories and industrial environments, where the risks associated with these materials are closely managed. Recognizing these characteristics enables personnel to identify cryogenic cylinders quickly and respond appropriately in emergency situations related to hazardous materials.