The research looked at how different types of coal break under pressure and how water affects this process. They squeezed coal samples in a lab to see how they broke and compared natural coal to water-soaked coal. It was found that wet coal was weaker than dry coal. The amount of broken coal varied with the type of coal and its strength, with wet coal creating more particles. As coal quality went up, more particles were generated. Additionally, the more pressure coal could handle, the fewer particles were produced. So, water content and coal quality play big roles in how coal breaks down.