Which of the following is a characteristic of non-flammable medical gases?

Non-flammable medical gases are designed to be safe for use in patient care, making them essential for various medical applications. These gases, which include oxygen, carbon dioxide, and medical air, do not pose a combustion risk, thus ensuring a safer environment in healthcare settings. Their non-flammable nature allows them to be used effectively in anesthetic and therapeutic procedures without the threat of fire or explosion, which is a critical consideration in medical facilities.

While other characteristics mentioned in the options may pertain to certain gases or substances, they do not apply to non-flammable medical gases. For instance, they are not explosive (thus ruling out the idea of being explosive in nature) and do not typically require special disposal methods that differ from standard waste management practices applicable in healthcare. Additionally, unlike some gases that might produce harmful vapors, non-flammable medical gases are specifically regulated to ensure they are safe for both patients and healthcare providers.