Soil Mechanics and Foundation
A fully saturated soil is said to be

two phase system with soil and air
one phase system
three phase system
two phase system with soil and water

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Soil Mechanics and Foundation
In hydrometer analysis for a soil mass

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

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