The Compaction Test is a laboratory procedure used to determine the optimal moisture content and maximum dry density of soil. This test helps engineers assess how well soil can be compacted, which is crucial for construction projects. The results guide decisions on soil treatment and foundation design. During the test, a soil sample is compacted in a mold using a standardized method, often involving a specific weight and height of a hammer. The moisture content is varied, and the dry density is calculated for each sample. This information is essential for ensuring the stability and durability of structures built on the soil, such as roads and buildings.