Soil Mechanics and Foundation
A pycnometer is used to determine

specific gravity and dry density
voids ratio and dry density
water content and voids ratio
water content and specific gravity

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Soil Mechanics and Foundation
Coefficient of compressibility is

different for different types of soils but same for a soil under different states of consolidation
independent of type of soil but depends on the stress history of soil
constant for any type of soil
different for different types of soils and also different for a soil under different states of consolidation

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