Science Projects And Inventions

YOU NEED:

• Two Iron Nail
• One Nine Volt battery
• Two 18 inch lengths of wire
• A Cardboard
• One Jar containing Salt water

Connect two iron nails to a 9 volt battery with two 18 inch lengths of wire. Punch two holes in a piece of cardboard and pass the nails through them. Place the nails in a jar of salt water. Soon you will see that air bubbles begin to collect around the nails. Leave the apparatus for about 6 hours. You will see that the nail connected to the positive terminal gets coated with a thin layer of iron oxide or rust.