What are gas cylinders primarily used for?

Gas cylinders are primarily used for storing gases under pressure in a durable container, designed for safe transport and handling. This function is crucial in a variety of industries, including construction, where gases such as oxygen, propane, and acetylene are used for different applications, including welding and cutting.

The design of gas cylinders allows them to contain gases in liquid form at high pressures, which can then be delivered in a controlled manner for various applications. This is a critical aspect of ensuring safety and efficiency in handling potentially hazardous materials, as the tanks are engineered to withstand high pressures and are equipped with specific valves and fittings to facilitate safe access and usage.

While other choices involve handling liquids and materials, they do not accurately represent the primary use of gas cylinders, which centers around gas storage and not the transportation of liquids or connections for liquid transfers.