What defines a demolition according to the given information?

The definition of demolition in this context refers specifically to how a substance reacts—namely, its ability to undergo a transformation that produces a large volume of gas very quickly. This process usually occurs through a rapid chemical reaction that releases energy, causing the material to expand explosively. This violent transformation into gas is a key aspect of the characteristics of explosives used in demolition processes.

In this case, the other options do not align with the definition of demolition as they describe materials that do not fit the criteria for explosive behavior. A solid substance that can burn may indicate combustible materials, but it lacks the rapid release of gas associated with demolition. A liquid that vaporizes upon heating describes a phase change rather than a chemical reaction leading to an explosive outcome. Similarly, a mixture that can cause a fire upon ignition does not capture the specific violent transformation and gas generation that defines demolition. Hence, the correct answer focuses on the explosive and reactive nature of the substance.