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Carrot and Celery Osmosis

Grade level: Ages 11-14

Big idea

In the film Superhuman Body, we learn about some of the body’s complex internal systems, including cells of the immune and circulatory system.

Activity overview

Discover osmosis with an experiment with carrots and celery left overnight in both fresh and salt water to learn how water moves through membranes and how that applies to movement of water and other substances through our body’s cells.

Videos in this lesson


  • Oil
  • Half a tablespoon of salt
  • 4 cups of water
  • Fresh water
  • Baby carrots
  • Celery
  • 2 Containers (bowls, glasses, cups)
  • Marker
  • Sink
  • Paper towels
  • Hand soap
  • Phone or tablet to capture time lapse video (optional)