Soil Mechanics and Foundation
In hydrometer analysis for a soil mass

both meniscus correction and dispersing agent correction are subtractive
both meniscus correction and dispersing agent correction are additive
meniscus correction is additive and dispersing agent correction is subtractive
meniscus correction is subtractive and dispersing agent correction is additive

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Soil Mechanics and Foundation
Coefficient of compressibility is

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

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