Condensation

• Investigate whether the process works with cold water instead of ice.Jupiterimages/Photos.com/Getty Images
  
  This project illustrates that there is water in the air, even though it cannot always be seen, through showing the process of condensation, a process which changes gas into liquid. Fill a jar with ice cubes and 2 tbsp. of salt. Screw the top in place, give the jar a good shake and then leave it on a flat surface for 10 minutes. Droplets of water should appear on the outside of the jar. Investigate why this happens and what sort of situations this method could apply to in providing drinkable water. Experiment with different ways of collecting water from the air.
  
  

Supercooling

• When water freezes it changes from a liquid to a solid.Comstock/Comstock/Getty Images
  
  Supercooling water allows it to hit freezing point without turning to ice and becoming solid. Pour some distilled water into a small plastic cup and cover with a piece of cardboard. Place the cup in a bowl, fill the bowl with ice and sprinkle two tbsp salt over the ice. Remove the cardboard lid and place a thermometer in the cup. Monitor the temperature for 10 to 20 minutes. Water freezes at 0 degrees Celsius, so it turns to a solid -- ice -- at that temperature, however, having supercooled the water, note what happens when the temperature reaches below zero.
  
  

Changing Forms

• A boiling kettle will prduce steam, which is a gas.Comstock/Comstock/Getty Images
  
  Experimenting with how solids, liquids and gases change form can be a fascinating way to learn about them and demonstrate the phenomenon to others. Think of the different ways water can be demonstrated in these three forms and how it can be changed from one form to another. Research the different processes that take place, such as condensation, boiling and freezing.
  
  

Oobleck

• Oobleck is made form very simple ingredients such as corn flour.Jupiterimages/Photos.com/Getty Images
  
  Oobleck is named after a havoc-wreaking, gooey, green substance in the Dr. Seuss book, "Bartholemew and the Oobleck." Mix together one cup water, 1/2 cup cornstarch and a few drops of food coloring. Slowly put your finger in. Do not eat it! You will discover the Oobleck is a liquid. Now place some in a bowl and slap it with your hand. It no longer feels like a liquid. Due to the size of the molecules compared to water molecules, when slapped, these molecules tangle together and act like a solid. When slowly poked, the molecules do not tangle, and the mixture acts like a liquid.