| Place a rock in a container, add water, and record the volume. | Pour an unknown amount of water into a glass container, add the rock, and note the water level; the unknown amount of water plus the weight of the rock is the volume of the rock. | ||
| Pour a known amount of water into a glass container, add the rock, and note the new water level; the difference in water levels is the volume of the rock. | Water displacement will not work. |