After filling a propane container and placing it in an enclosed vehicle, what should you do if you observe white vapor and hear a hissing sound?

When you notice white vapor and hear a hissing sound coming from a propane container placed in an enclosed vehicle, this indicates that there may be gas escaping from the container, which can create a highly dangerous situation.

The presence of white vapor typically points to propane vapor being released, and the hissing sound suggests that there is pressure escaping from the container, potentially due to overfilling or a leak. In such a scenario, it is crucial to act quickly to prevent the risk of fire, explosion, or asphyxiation.

Removing the cylinder immediately is the appropriate response because it allows you to take the potentially hazardous material out of an enclosed space, significantly reducing the risk of flammable vapor accumulating and igniting. Ensuring that the propane container is relocated to a safe, well-ventilated outdoor area can help to mitigate the danger.

It's also important to handle the cylinder carefully during removal to avoid further damage or complications. This action prioritizes safety for both the individuals present and the environment.