When water evaporates it leaves all of its impurities behind. Evaporation removes impurities, such as salts and heavy metals, and eliminates microbiological organisms. The end result is water cleaner than the purest rainwater.
Make students understand that water can be made drinkable with easy to find resources, just by using the heat of the sun.
• Wide plastic or glass basin
• Smaller jar or glass for collecting the clean water
• Large piece of transparent plastic—plastic wrap works
• String or rubber band to hold plastic in place
• Small stone
Share this page on