Observe the effect that salt has on the temperature of water in this zappy experiment.
Things Required:
Crushed ice
Water
3 tablespoonfuls of table salt
Metal food can that will hold about 2 cups of liquid
Directions:
Fill the can with crushed ice. Add 1 cup of water to the can. Wait two to three minutes until water collects on the outside of the can. Add 3 tablespoonfuls of table salt to the icy water. Gently stir the icy, salt water. Allow the can to sit for five minutes or until a thin layer of frost forms on the outside of the can.
This Is What Happens:
At first the outside of the can becomes covered with water. This water on the outside froze when salt was added to the icy water.
Science Behind It:
Air contains the molecules of water in gaseous form. This gas cools when it touches the chilled can and changes to liquid water. The salt lowers the temperature of the icy water, which causes the temperature of the can to be lowered. The drops of water on the outside freeze and form a frosty coating around the can.
