Soil Mechanics and Foundation
Effective stress is

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

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Soil Mechanics and Foundation
In hydrometer analysis for a soil mass

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

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