A glass is initially filled with some water, see Figure 3.4. The volume of the water is measured to be 240 cm3. Some sand particles are carefully poured into the water, avoiding the formation of air bubbles. The water table in the glass then rises to indicate a volume of 320 cm3. The sand particles come to rest at the bottom of the glass, indicating a total volume of 144 cm3. Calculate the porosity n of the sand. Also calculate the void ratio e.
