A soil sample is collected just before irrigation, and another soil sample is collected two days after irrigation. The soil sample collected before irrigation weighs $1\mathrm{.}34$ kg $,$ and the soil collected just after irrigation weights $1\mathrm{.}64$ kg $.$ Both soils are placed in an oven and dried at $100C$ for $24$ hours. After drying, the soil collected just before irrigation weighs $1\mathrm{.}41$ kg and the soil collected just after irrigation weighs $1\mathrm{.}49$ kg $.$ What are the volumetric water contents just before and just after irrigation?

Determine the time required for all particles $($all sand$)$ larger than $0\mathrm{.}05$ mm $(0\mathrm{.}005cm)$ to fall $12$ cm in a suspension at $25C.$