SOLAR STILL

ANNA VAZQUEZ, UMAIR M

UHAMMAD, ORIOL F

ERNANDEZ, MARC CARAVACA

INTRODUCTION

Did you know that water covers about 70% of the Earth?

But almost all of it is in the oceans and undrinkable.

INTRODUCTION

The solar still uses solar energy to purify water.

EQUIPMENTPlastic Bowl Evaporating Dish Salt

Cling Film

Small StoneA Beaker with Hot WaterFood Dye

PROCEDURE

1st We add some food coloring and a teaspoon of salt.

PROCEDURE

2nd We then put the cup in the middle of the bowl.

PROCEDURE

3rd We add the hot water to the bowl until it is about one centimeter full.

PROCEDURE

4th Then we’ll cover the bowl loosely with cling film, sealing the film to the rim of the

bowl. You can use tape or string to do this if necessary.

PROCEDURE5th Now we’ll take the equipment out to a sunny, level place.

6th Next we’re going to place the stone on top of the film, in the middle above the cup.

7th Now we’re ready to leave the still for at least an hour, the longer the better.

PROCEDURE

8th Then we’ll check to see if there is some water in the cup.

9th When we have some water in the cup, we’ll take the still back indoors and remove

the cling film.

10th Then we’ll take out the cup without splashing any water into or out of the cup.

11th Now we measure the amount of water in the cup and observe the color of the

water in it and test it for salt.

PROCEDURE

12th Here is how we then calculate the percentage of the water that was purified:

13th Lastly, we observe our results and see if we can explain what happened to thewater.

CONCLUSION

Now you may be wondering why it is called “purified water”. Well, what ideas do you

have? Tell me.

THANKS FOR YOUR ATTENTION