 I have a container of water balanced on top of a mug, which has warm water in it. I also have two droppers, one with blue liquid food color and one with red liquid food color. I will drop the blue liquid food color near the sides of the container like this. And I will drop the red liquid food color in the middle just above the warm water in the mug like this. At this point, can you predict what will happen? How will the liquid food colors move inside the water in the container? Make a prediction. All right, let's see. Well, we see that the red liquid food color is rising to the top and the blue liquid food color is moving to the bottom in the middle. And notice as the blue liquid food color moves to the middle of the container, it starts rising up. The blue liquid food color now starts rising up. Why did this happen? Can you think of an explanation?