The researchers studied making charcoal briquettes from maize cob waste to see how compaction pressure and particle size affect their quality. They crushed the waste, mixed it with sago flour and water, then pressed it into briquettes. By analyzing the briquettes, they found that different pressures and particle sizes changed the density, moisture content, ash content, heating value, and burning characteristics of the briquettes. This shows that adjusting the pressure and particle size can impact the quality of bio charcoal briquettes made from agricultural waste.