Compaction :

1. Compaction is the process by which solid soil particles are packed more closely together by mechanical means.

2. It is achieved through reduction of air voids.

3. It is a rapid process.

4. It is an artificial process.

5. Proper compaction of soil is achieved at optimum moisture content.

Consolidation:

1. Consolidation is the process by which soil particles are packed more closely together under the application of static loading

2. It is achieved through gradual drainage of water from soil pores.

3. It is a gradual process. In some soils it takes many years.

4. It is a natural process.

5. Consolidation is strictly applicable for saturated or nearly saturated clay's or soils with low permeability.