How can you accurately determine the type of gas in a cylinder if color coding is only used as a guideline?

The most reliable way to accurately determine the type of gas in a cylinder, especially when color coding is only a guideline, is through careful inspection of the label. Labels on gas cylinders provide critical information regarding the contents, including the type of gas, its classification, and safety handling instructions. This labeling is a regulatory requirement and is designed to assist users in identifying the gas accurately and ensuring safe handling procedures.

While color coding can provide a quick visual reference, it may not always be accurate due to the potential for similar colors or the fading of paint over time. Other methods, such as checking the pressure gauge, measuring temperature, or observing gas behavior, can provide indirect information but are not definitive in identifying the gas type. For example, different gases may have similar pressure readings, and gas behavior can vary under different conditions. Therefore, reading the label is the most straightforward and effective method to ensure clarity and safety when handling medical gas cylinders.