Density

Objective:

  • To describe how the concept of density is related to the mass and volume of a substance.
  • To explain why changing the mass or volume of a substance does not affect its density.

Virtual Experiment

In a virtual simulation, you will work with blocks of different materials, including special materials, to investigate density. Density is a property that shows how heavy or light an object is compared to its volume. If a substance has a high density, it is heavy, and if it is small, it is light.

The illustrations below show the functions each button performs.

Progress:

Part 1. Introduction. Density of matter

There are three different sections in the virtual simulation: introduction, comparison, riddle. Open the “introduction” section.

Step 1: When the simulation is on:

  • A wood material is given.
  • The weight of the wood: 2 kg.
  • Volume of wood: 5 liters.
  • Density of wood: 0.4 kg/L.

The density of water is 1 kg/L. Because the density of wood is less than that of water, you will see that the wood is partially submerged in water rather than submerged in water.

Step 2. Try changing the weight or size of the tree. You will notice that they increase and decrease in direct proportion to each other.

Step 3. Take the tree out of the water. You will see that the volume of the water is 100 liters. That is, when there is any material in the water, the volume of the container is equal to the sum of the volume of the substance and the water.

Step 4. Replace the next type of material with aluminum. It has a density of 2.70 kg/L. It sinks in water because of its greater density than water.

Step 5. Try to investigate the density and sinking of the object by selecting other objects. (If you choose a custom material, you can provide your own volume and mass data).

Step 6. Switch from the “put one block” button on the right edge of the container to the “put two blocks” button. 

Step 7. Place two objects in the container. One is Styrofoam (density 0.15 kg/L) and the other is brick (density 2 kg/L). From here you can clearly see that the drowning levels are different due to the different densities of the substance.

Step 8. If you find it necessary, you can do some practice by choosing other materials. (If you choose a custom material, you can provide your own volume and mass data).

Part 2. Comparison

Open the “comparison” section in the virtual simulation.

Step 9. Go to the “comparison” section from the “introduction” section.

Step 10. In the “blocks” section, “same mass” is selected. Therefore, no matter what your density and volume of these materials are, they have the same weight (5 kg).

Step 11. Place the materials in the water. You will notice that each material sinks into the water at different levels depending on the density. Also, you can conclude that when bodies have the same weight, the greater the volume, the lower the density.

Step 12. Under “blocks,” select “same volume.” Regardless of the density and weight of the materials you have, the volumes are the same (5 liters).

Step 13. Place the materials in the water. Compare them to each other.

Step 14. In the blocks section, select “with the same density.” No matter what your volume and weight of the materials provided, the density is the same (0.5 kg/L).

Step 15. Place the materials in the water. Compare them to each other. Try to affect the level of sinking by increasing or decreasing the density.

Step 16. Recall your experience and draw conclusions.

Conclusion

By performing the virtual activity, students were introduced to the concept of density and explored the relationship of volume and weight to density.