# Dry Bulk Density of Soil

Written by Jerry Ratzlaff on . Posted in Geotechnical Engineering

Dry bulk density of soil, abbreviated as $$Y_{dry}$$, is the ratio between the total mass of soil and the total volume of soil.

## Dry bulk density of soil formulas

 $$\large{ Y_{dry} = \frac { M_s} {V_t } }$$ $$\large{ Y_{dry} = \frac{ G_s }{ 1 \;+\; e } \; \rho_w }$$ $$\large{ Y_{dry} = \frac{ G_s \; \rho_w }{ 1 \;+\; e } }$$ $$\large{ Y_{dry} = \frac{ G_s }{ 1 \;+\; w \; G_s } \; \rho_w }$$ $$\large{ Y_{dry} = \frac{ G_s \; \left( 1 \;-\; A \right) }{ 1 \;+\; w \; G_s } \; \rho_w }$$

### Where:

$$\large{ Y_{dry} }$$ = dry bulk density of soil

$$\large{ A }$$ = air content

$$\large{ \rho_w }$$  (Greek symbol rho) = density of water

$$\large{ M_s }$$ = mass of soil

$$\large{ G_s }$$ = specific gravity of soil

$$\large{ V_t }$$ = total volume of soil

$$\large{ e }$$ = void ratio

$$\large{ w }$$ = water content