Take two paper bags of same size. Fill one with sand and the other with dry leaves. Discuss their weights (which bag is heavier).
The bag filled with sand will be heavier than the bag filled with dry leaves.
Explanation: Sand is denser and packs more tightly, so the same volume of sand weighs more than the same volume of dry leaves. Dry leaves have air spaces between them and are less dense, making them lighter.
Observation: When placed on a balance, the sand bag will make its side go down.
Explanation
This activity demonstrates that even when containers are the same size, the material inside determines the weight. Sand is much denser than dry leaves, so the sand-filled bag is heavier.
Solution Steps
Compare two paper bags of same size filled with different materials (sand vs. dry leaves)
Identify that sand is denser and packs more tightly than dry leaves
Note that dry leaves have air spaces and are less dense
Conclude that the sand-filled bag is heavier