Which of the following can be a material for gas piping?

Gas piping materials must be capable of safely transporting gas while withstanding pressure and environmental factors. Steel is commonly used due to its strength and durability, making it suitable for high-pressure applications. Copper is another viable option; it has excellent corrosion resistance and is often used for low-pressure gas systems. Various types of plastic, especially high-density polyethylene (HDPE), are also accepted for gas distribution because they resist corrosion and are lightweight, although typically utilized in specific applications and conforming to local regulations.

The other materials presented in the other choices do not meet the safety and durability standards typically required for gas piping. For instance, PVC is generally unsuitable for gas piping applications because it can become brittle under certain conditions and isn’t designed to handle the high pressures associated with gas distribution. Wood and glass are not suitable due to their lack of structural integrity and inability to safely handle gas pressures. The choice of materials must comply with local codes and standards that prioritize safety and efficiency in gas distribution systems.