NFPA-99 Practice Exam 2025 – The All-in-One Guide to Exam Success!

The correct answer is based on the NFPA 99 definition, which specifies that a "cylinder" is a low-pressure, vacuum-insulated vessel designed to hold gases in liquid form. This definition aligns with the context of the NFPA 99 standards, which focus on safety in healthcare facilities, particularly concerning medical gases.

Cylinders are designed to maintain the integrity of the gases they contain, often using insulation to prevent loss of gas through temperature changes. The term "cylinder" is commonly used in the industry to refer to such vessels, especially when discussing the storage and delivery of gases like oxygen or nitrous oxide in medical settings.

In contrast, the other options do not accurately reflect the specific definition provided by NFPA 99. An "appliance" typically refers to equipment or devices utilizing these gases rather than the containers themselves. A "container" is a more general term that could apply to many types of storage vessels and might not imply the same level of specification regarding pressure and insulation. A "safety can," while applicable to flammable liquids, is not relevant within the context of liquid gases and their storage. Thus, the term "cylinder" is the most precise and appropriate choice in this context.