What does the number "240" represent in the cylinder marking "4BW-240"?

In the marking "4BW-240," the number "240" specifically indicates the pressure rating of the cylinder, which is expressed in psi, or pounds per square inch. This signifies that the cylinder is rated to safely contain gas at a pressure of up to 240 psi. Understanding this aspect is essential for the safe handling and usage of gas cylinders, as exceeding this pressure can lead to dangerous failures.

The other options reflect different concepts relevant to gas cylinders. Maximum weight pertains to the overall weight that the cylinder can support safely, while gas type identifies what gas is contained within the cylinder. Temperature rating would refer to the environmental conditions under which the cylinder can operate safely, but does not directly relate to the number "240" in this context, which clearly indicates a pressure measurement.