Solar Water Desalination Ingredients Glass container, like a casserole baking dish Smaller glass container whose height is less than the height edge the first container when it sits inside the first container, like a small glass serving dish.

Solar Water Desalination Ingredients Glass container, like a casserole baking dish Smaller glass container whose height is less than the height edge the first container when it sits inside the first container, like a small glass serving dish. Plastic wrap 1 cup of water 1/2 teaspoon salt 1 Spoon A few weights, such as marbles, rocks or several glass beads

Directions

1) Pour the water into the larger container. Add salt. Stir.

2) Place the smaller container inside the larger container in the center.

3) Cover the larger container with plastic wrap. The wrap should not be touching the smaller container.

4) Add the weights to the center of the container. This is the location where water that condenses on the plastic wrap will gather and drip into the smaller container.

5) Let it sit for two hours to several hours in the sun. The longer it sits, the more water will collect in the smaller container.

Questions and Extras

How much desalinated water did you get? How effective was the solar still in distill the salt water?

Taste your desalinated water and then the salty water. Why does the desalinated water taste different than tap water?

Discuss the operation of your solar still in terms of thermal radiation, conduction, convection, the change of state of the water, and the conservation of energy.

Does the size and shape of the outer (evaporating) container affect its efficiency?

Does the depth (volume) of water in the evaporating container affect its efficiency? Any suggestions for improvements?