In the demo video, two container with water (one dyed red, one dyed blue) are placed in a fish tank, also filled with water. What happens and why?
A. The cold water rises because it is more dense than the warm
B. The warm water rises because it is less dense than the cold
C. Both sink because they have the same density
D. Both rise because they have the same density
B. The warm water rises because it is less dense than the cold water.
When water is heated, its molecules gain energy and move faster, causing them to spread apart. This increased kinetic energy decreases the average density of the warm water compared to the cold water. As a result, the warm water becomes less dense and rises to the top, while the colder, denser water sinks to the bottom.