First you need to gather up all of the materials you will need. Below is a list of the following items needed to conduct this study:
- A tablespoon
- Large clear bowl
- Small glass
- Saran wrap
- Sunny day
Are you ready? Let’s get started. First, you need to look at the weather and make sure that it’s sunny outside and will be the rest of the day. Grab the large clear bowl and fill it with water. Take the tablespoon and stir several tablespoons of salt into the water until the salt has dissolved. Place the small empty glass in the middle of the large clear bowl then cover the bowl completely with saran wrap so that no air can get through. Leave the bowl out in the sun (preferably for a few days) and observe what happens.
What happened? Is there fresh water in the small glass? There should be. Can you figure out why? The heat from the sun should form water vapor from the salt water in the bowl on the underside of the saran wrap. The vapor then condenses on the saran wrap and drips into the small glass in the middle of the bowl as fresh water. Cool, huh?