What must all gas containers and related equipment be protected from?

Gas containers and related equipment must be protected from extreme temperature and physical damage to ensure safe handling and operation. High temperatures can lead to increased pressure within gas containers, potentially resulting in leaks or even explosions. Additionally, physical damage to gas containers can compromise their structural integrity, leading to hazardous spills or releases of gas. Protecting against these risks is essential to maintain safety standards in torch operations and prevent accidents.

While the other options address various protective measures, they do not encompass the critical concerns associated with gas safety in the same way. For example, moisture and excessive weight could lead to corrosion or structural failure but do not directly address the risks posed by extreme temperatures or physical impact. Similarly, sunlight and humidity can affect some materials but are not as pivotal as managing extreme temperatures. Electrical interference and rust may be important in certain contexts, but they are less directly related to the immediate risks faced by gas containers compared to extreme temperature and physical damage.