What is the pressure inside a full oxygen cylinder at room temperature approximately?

The pressure inside a full oxygen cylinder at room temperature is approximately 2000 PSIG. This value is derived from standard practices in the industrial and medical use of compressed gases. Oxygen cylinders, particularly those that are used in healthcare settings, are typically filled to a pressure of about 2000 PSI (pounds per square inch) when they are full.

This high-pressure level is necessary to store sufficient oxygen in a relatively compact size, allowing for effective transport and use in various medical applications, such as respiratory therapies. The high pressure also ensures that a significant volume of gas can be released when needed.

In contrast, the other pressure values listed do not accurately reflect the typical pressures found in full oxygen cylinders. For instance, 30 PSIG represents a much lower pressure, which is not sufficient for a full cylinder. Similar reasoning applies to the options of 900 PSIG and 5000 PSIG; the former is below the standard for a full cylinder, and the latter is excessively high and not feasible for standard medical oxygen tanks, which could pose safety risks if such pressures were present in commonly used cylinders.