Which gas is specifically noted for having a nonflammable property?

The property of nonflammability means that the substance does not support combustion and is not capable of igniting or burning in the presence of an ignition source. In the context of medical gases, it is important to understand their behavior, particularly in terms of safety.

Nitrous oxide is a gas commonly used in medical settings as an anesthetic and analgesic. Although it can act as an oxidizer under certain conditions, it itself is not flammable, making it safe for use in environments where flammable gases may pose a risk.

Helium is an inert gas that is nonreactive and does not support combustion, which makes it one of the safest gases used in various applications, including medical use and balloon inflation.

Carbon dioxide, while not often associated with the same applications as the others, is also nonflammable. It is used in medical settings for various purposes, including as a physiological agent during certain procedures.

Since all three gases—nitrous oxide, helium, and carbon dioxide—possess properties that make them nonflammable under normal conditions, the correct conclusion is that all the listed gases share this characteristic. Hence, recognizing that each of these gases is nonflammable contributes to ensuring safe practices in medical environments, thus leading to the