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Solar Still

Materials

  • Bowl
  • Plastic cup, 1" shorter than sides of bowl or cut to size
  • Clear plastic food wrap
  • Tape or rubber band large enough to go around bowl
  • Small rock or weight
  • Salty or colored water


    Illustration of bowl

Procedure

  1. Put salty or colored water in the bowl.

  2. Place the cup in the center of the bowl.

  3. Stretch clear plastic wrap over the top of the bowl and secure with tape or a rubber band.
    Make sure the seal is tight and no air can escape.

  4. Place a weight on the center of the plastic wrap above the cup.
    Press down slightly on the plastic wrap so it stretches and sags down over the cup.

  5. Place the solar still in full sun.

  6. Observe what happens.

  7. After some water collects in the cup, taste it.
    • Is the water clear?
    • Does it taste salty?
    • Why does the water taste different that tap water.

Photo of clear glass bowl with colored solution in bottom, covered in clear plastic wrap, with small weight on top.

 

 

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