Science Projects And Inventions

YOU  NEED:

• An ice cube
• A glass of water
• A string, salt

You can pull off this one and surprise your friends. Put the ice cube in glass of water. It floats. Lay the string alongside the glass and tell your friends that you can use the string to lift the cube out of the glass. Of course they won’t believe you. Here is what you do. Lay one end of the string across the top of the cube. Sprinkle a sizeable amount of salt on the string. Lift the string and the ice cube will come out with it.

HOW DOES IT WORK?

ff an ice cube is put in water, it constantly shrinks and grows because the surface melts and then re-freezes. Once salt is added to the ice cube, it keeps the water from re-freezing on the surface of the cube. The salt comes in the way of the water molecules which try to re-form into ice. Given that the ice cubes have water around it the salt is carried away into the rest of the glass. The molecules of water once again become ice with the lessening of the salt. Here, however, the ice freezes around the string and holds it in place so that the ice cube can be lifted.