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SUBJECT
Relative compaction is defined as the ratio of the dry unit weight of soil in the natural state to the dry unit weight of soil in the densest state. it can applied for both cohesionless &cohesive soil.
It is defined as the ratio of the difference between the void ratio of soil in the loosest state & natural state to the difference in the void ratio of soil in the loosest state & densest state.
Specific Gravity is the ratio of the weight of a given volume to the weight of standard fluid (water) of the same volume. It is represented as ‘G’. It is the Unit less. There are two types of specific gravity: True/Absolute Specific Gravity and Mass/Bulk/Apparent Specific Gravity
Unit Weight is the ratio of weight to volume. It is also known as the specific weight. And Density is the ratio of Mass to volume.