What does the term 'explosibility' refer to in coal mining?

The term 'explosibility' in coal mining specifically refers to the capacity of coal dust to explode. This concept is critical in understanding the hazards associated with coal dust accumulation in underground mines. When certain conditions of dust concentration, particle size, and the presence of ignition sources are met, coal dust can ignite and lead to a powerful explosion. This risk underscores the importance of effective ventilation and dust management in mining operations to minimize the potential for explosive atmospheres.

The other options relate to different but important aspects of coal: combustibility refers to the ability to catch fire, ignitability describes the capacity to ignite, and the weight of coal dust particles is a physical characteristic. While these concepts are relevant in the context of mining safety, they do not specifically define 'explosibility,' which focuses solely on the explosive potential of coal dust.