Lecture Notes: Experiment on Water Density

Experiment Setup

• Objective: To observe how hot water behaves when introduced to cold water.
• Materials:
  • Tub of cold water
  • Vial with hot, teal-colored water

Procedure

1. Pour hot, colored water into cold water.
2. Poke a hole in the roof of the container and observe the movement of the colored water.
3. Draw a macro view on paper:
   • Tub of cold water
   • Vial with colored water
   • Label the rising colored water as hot water.

Observations

• The hot teal water flows out and rises.
• The green color (teal water) rises up.

Key Concepts

• Density of Water:
  • Hot Water: Less dense than cold water.
  • Cold Water: More dense.
• Particle Behavior:
  • No substance added to the water.
  • When heated, water molecules expand, taking up more space.
  • Result: Hot water is less dense and floats on cold water.

Conclusion

• Hot water rises in cold water because it is less dense due to the expansion of particles when heated.