What indicates a full medical gas tank?

A high pressure reading on the gauge is an indicator of a full medical gas tank. Medical gas tanks are equipped with pressure gauges that display the pressure of the gas within. When the tank is full, the gauge will typically show a high reading, reflecting the maximum storage capacity of the gas. Manufacturers set specific pressure thresholds for different gases, and a full tank often corresponds to a pressure reading significantly above the operational range, indicating that there is a sufficient volume of gas available for use.

The other options may provide some context about the condition of the gas tank but do not directly indicate fullness. For example, while a green color on the cylinder may denote specific types of medical gases, it does not quantify the gas amount. Similarly, an attached safety cap is important for safety but does not provide information about the tank's gas level. Lastly, the weight of the tank can vary based on the material and size, making it an unreliable method for assessing gas fullness. Therefore, the pressure gauge is the most reliable and accurate measure for determining whether a medical gas tank is full.