Porosity of Rocks


What You Need:


Both the chalk and the rock will weigh more than their dry weight. The amount of water the rock can hold can be measured using the displacement method. In this case: 

Weight of dry rock: 34gms
Weight of rock after 24 hours in water: 37gms
Total water absorbed by rock: 3gms or 3cc
Water level in the container: 150ml
Water level in the container after placing the rock: 175ml
Volume of the rock: 25ml or 25cc.
To calculate the quantity of water the stone can hold in percentage volume: Volume of water absorbed/Volume of stone = 3cc/25cc = 12%