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Let $G$ be the specific gravity of soil solids, $w$ the water content in the soil sample, $\gamma_w$ the unit weight of water, and $\gamma_d$ the dry unit weight of the soil. The equation for the zero air voids line in a compaction test plot is

  1. $\gamma_d = \dfrac{G \gamma_w}{1+Gw} \\$
  2. $\gamma_d = \dfrac{G \gamma_w}{Gw} \\$
  3. $\gamma_d = \dfrac{Gw}{1 + \gamma_w} \\$
  4. $\gamma_d = \dfrac{Gw}{1 –  \gamma_w}$
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