Soil Mechanics and Foundation
Effective stress is

important because it is a function of engineering properties of soil
the stress at particles contact
a physical parameter that can be measured
All of these

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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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