Soil Mechanics and Foundation
In hydrometer analysis for a soil mass

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

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Soil Mechanics and Foundation
With the increase in the amount of compaction energy

both optimum water content and maximum dry density increase
optimum water content decreases but maximum dry density increases
optimum water content increases but maximum dry density decreases
both optimum water content and maximum dry density decrease[ES 93]

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