GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Suspension of chalk in water, photo 2 of 3. Sidewalk chalk (calcium sulfate, CaSO4) is poorly soluble in water and forms a white suspension. Photo 1 shows chalk and water separately. Photo 2 shows suspension after chalk is mixed into water. Photo 3 shows chalk settled after some time at the bottom. This is photo 2 of 3.
Model release not required. Property release not required.