To ensure safety, a can or bottle of fire scene material should not be more than what fraction full?

In the context of ensuring safety when handling containers of fire scene materials, having a can or bottle no more than two-thirds full is crucial. This guideline is important primarily to prevent spills and overflows during handling, especially since these materials may be volatile or hazardous.

When a container is two-thirds full, it allows enough space for movement, which can happen during transportation or when the container is being used. If the container were to be full, the risk of spillage increases, which could create dangerous situations, especially in the presence of flammable substances at a fire scene.

Moreover, a container that is too full has less room for air, which is critical when dealing with reactions that might occur due to changes in temperature or pressure. This safety measure is practiced widely to minimize risks and ensure the safety of investigators and the environment during fire investigations.