What effect does an increase in volatile matter in coal have on explosibility?

An increase in volatile matter in coal significantly affects its explosibility by increasing it. Volatile matter refers to the components of coal that are released as gases or vapors when the coal is heated. This includes a variety of compounds, such as water vapor, hydrocarbons, and other gaseous substances.

When the volatile matter content is higher, more combustible gases are produced during heating. This enhances the potential for combustion, making the coal more prone to ignition and subsequent explosion in a confined space, such as an underground mine. The presence of additional flammable gases increases the likelihood of a fire or explosion, especially when there is a sufficient supply of oxygen present and the appropriate conditions for ignition are met.

In contrast, coal with lower volatile matter content tends to produce less gas when heated, which reduces its potential for explosive reactions. Thus, understanding the relationship between volatile matter and explosibility is critical for assessing safety risks in mining operations.