What is an example of a mass explosion hazard?

TNT, or trinitrotoluene, serves as an excellent example of a mass explosion hazard due to its properties and the way it behaves under certain conditions. This compound is a high explosive, meaning it can produce a significant blast effect when detonated. It is known for its stability and is commonly used in military munitions, particularly in larger quantities, which can lead to widespread destruction and damage across a large area when triggered.

Mass explosion hazards typically involve substances that can detonate, resulting in a rapid release of energy that can affect a vast surrounding area, potentially causing catastrophic damage. TNT, when present in sufficient quantities, can initiate a mass explosion and is utilized in various applications that leverage its explosive capacity, such as bomb-making and demolition work.

Other substances mentioned, like hand grenades and cannon shells, while also explosive, do not classify as mass explosion hazards since they are designed for specific purposes and operate at a smaller scale. Smoke bombs do not fall under explosive hazards in the same category and are primarily used for signaling or providing cover, lacking the massive destruction potential that characterizes mass explosion hazards. Thus, TNT stands out distinctly as the correct answer within this context.