An Ice Cube Lifter
Lift an ice cube with a string
What you need
Ice cubes
Glass
Water
String
Salt shaker
What you do
Fill the glass with water
Put an ice cube into the glass
Place the string on the ice cube in such a manner that the mid portion of it makes contact with the ice cube; leave both ends of the string on either side of the glass for an easy grasp.
Sprinkle salt on the portion of the ice cube where the string makes contact with it
Lift the string after a minute or two. The string will adhere to the ice cube at the area where salt was sprinkled on it.
What happened?
Salt lowers the freezing point of ice, causing the ice surrounding the string to melt. The ice then refreezes around the string. But the melting water flows off the cube and flushes some of the salt away. The lower salt concentration raises the freezing point again so the water refreezes. As it does, it traps the string and you've caught yourself an ice cube!
|
