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Soils having larger particles are usually
heavier in weight per unit volume than those having smaller particles.
True density of a soil is based on the individual densities of soil
constituents and according to their proportionate contribution. The bulk
density or apparent density is the weight per unit volume of dry soil as a
whole i.e. particle and pore space and hence it is lower than the true
density. The relationship between the true density (T) and the apparent
density (A) and the pore space (P) is as follows:
P%=(T-A)x100/T
In most mineral soils the
true density varies within narrow limits of about 2.5 to 2.7 and the
apparent density between 1.4 and 1.8. |