Grade Levels: 4-6
Questions: Can you distill clean water from muddy water? Can you distill clean water from salty water?
Possible Hypotheses: You can/cannot make clean water from muddy water. You can/cannot make clean water from salty water.
Materials: Two large plastic containers Clear plastic wrap Masking tape Two small rocks Two small glasses Two tablespoons of dirt Two tablespoons of salt Water
- Fill both plastic containers with one inch of water. Mix the dirt into the water in one and the salt into the other.
- Place one empty glass upright into the middle of each plastic container. Make sure it remains empty.
- Cover both plastic containers tightly with plastic wrap and seal them with tape. Place a small rock in the middle of the plastic wrap directly over the glass but not touching it.
- Place the stills in a sunny place for two hours. Examine any water that forms in the glass. Record your observations.
Analysis and Conclusion: Did the stills make clean water? Can you explain how they worked? Can you imagine a situation in which knowledge could save your life?
Reprinted with the permission of the NEED Project. © 2008 National Energy Education Development Project - All Rights Reserved.
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