Hot, freezing and room temperature water. Whats the difference???????

Today we did an experiment. We had cold, hot, and room temperature water. In each one we put some food coloring. In the hot one the color spread the most because it has less density, so it could not go all the way down. Also the particles in it filled as much space as it can. In room temperature it kind of fell down because it has a little kinetic energy. And for the cold one, it just fell to the bottom because it has more density.