Water Density and Layering Experiments

In this video tutorial from Glasgow Science Center, the presenter explores how temperature affects the density of water. The video begins with an introduction to the concept of density and how different liquids interact based on their densities. The presenter explains that heating water causes its molecules to move faster, making hot water less dense than cold water. An experiment is demonstrated where colored hot and cold water are layered to observe their interactions. The video concludes with a call to share experiment results on social media.

What is the primary reason oil floats on water?

• Oil is less transparent than water.

• Oil is more viscous than water.

• Oil has a lower density than water.

• Oil is lighter than water.

How does heating water affect its molecules?

• They change into a different substance.

• They move slower and closer together.

• They move faster and spread apart.

• They become larger in size.

Why does cold water sink when placed on top of hot water?

• Cold water is heavier due to impurities.

• Cold water is less dense than hot water.

• Cold water is more dense than hot water.

• Cold water evaporates quickly.

In the first experiment, what happens when cold water is placed on top of hot water?

• The hot water rises and mixes with the cold water.

• The cold water sinks and mixes with the hot water.

• The cold water evaporates.

• The two layers remain separate.

What is the main difference in setup between the first and second experiments?

• The size of the glasses used.

• The order of layering the water.

• The temperature of the water.

• The type of dye used.

What is observed when hot water is placed on top of cold water in the second experiment?

• The layers remain mostly separate.

• The cold water rises to the top.

• The layers mix completely.

• The hot water sinks to the bottom.

Why do the layers in the second experiment only slightly mix?

• The hot water is denser than the cold water.

• The cold water evaporates quickly.

• The cold water is denser than the hot water.

• The hot water is more viscous.

What is the purpose of using food dye in the experiments?

• To make the water more visible.

• To increase the temperature of the water.

• To change the density of the water.

• To visually distinguish between hot and cold water.

What should you do if you try the experiment at home?

• Mix the water thoroughly.

• Use only one color of dye.

• Use a different liquid instead of water.

• Share your results on social media.

Where can you share your experiment results?

• On the GSC1 Twitter page.

• In a classroom presentation.

• In a scientific journal.

• On the Glasgow Science Center website.