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

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

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Soil Mechanics and Foundation
In hydrometer analysis for a soil mass

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

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