Take a flashlight and shine it in a dark room, you will see small particles in the air your light shines through. Place one drop of food coloring into a glass of water. Draw the motion of the particles in the water. Hit a tuning fork and touch the single end against the tip of your finger. Click on the picture showing the materils involved to see a movie of what happens.
Heat is considered to have an effect on how particles move.
To see the relationship between movement and heat, rub your hands together. Repeat the experiment of placing a drop of food coloring into a glass of water. This time use a different temperature of water. If you want to watch a movie of food coloring in heated water follow the link. There is also a movie of food coloring in stirred water .