What should you never do with fuel gas, especially acetylene?

Releasing a large amount of fuel gas, particularly acetylene, poses significant safety risks due to its highly flammable nature. Acetylene is a gas that can form explosive mixtures with air, and even small amounts can be dangerous if not handled properly. When a large volume is released, it increases the risk of ignition if there are any open flames or sparks nearby.

Moreover, handling acetylene requires stringent safety protocols to prevent leaks and ensure that the gas does not accumulate in confined spaces, which can lead to hazardous situations such as explosions or asphyxiation. It is essential to control the release of combustible gases to maintain a safe working environment and prevent accidents.

In contrast, the other options you encountered involve certain risks as well, but they are typically managed through proper protocols. For example, storing gases in closed containers is important, but it needs to be done correctly with appropriate ventilation and following safety guidelines. Similarly, using gases indoors typically requires good ventilation systems to avoid dangerous concentrations, and mixing gases should only be done with proper understanding and adherence to safety standards. However, the immediate danger of releasing a large amount of acetylene makes it the most critical safety concern.