1. cut up 3 potato pieces. cut the pieces so that they are different sizes. 2. put food coloring in each cup, and then place one potato piece in each cup. 3. after a few minutes, take the potato pieces out and cut them in half. 4. observe how far the food coloring penetrated the potato pieces, and determine how that relates to surface area and volume. in the lab, what do the potato pieces represent? what does the food coloring represent?