What is needed:
cup, water, ice cubes, plate, cotton string, salt
What to do:
1. Fill the glass with water. Set it aside for the moment.
2. Put the ice cubes on the plate.
3. Dip the end of the string in the glass of water.
4. Lay the wet end of the string on top of an ice cube.
5. Sprinkle some salt over hte end of the string and the ice cube.
6. Wait 15 to 20 second. Then pick up the string--the ice cube will come with it.
How it works:
You froze the string to the top of the ice cube, which is what let you pick it up. Ice melts above 32 degrees F. The ice cube started to melt as soon as it was taken out of the freezer.
Adding salt lowers the ice's melting point. Normally, a little bit of the melted water on top of the ice cube would refreeze. But the salt makes the ice melt faster than it freezes.
When you put the string on top of the ice cube, the ice cube absorbs heat from the wet string and from the air. As the heat gets sucked out of the water in the string, tthe water and the string freeze to the ice cube.
Taken from: The Mad Scientist's Notebook by Elizabeth Snoke Harris and Rain Newcomb.
what a cutie!!! he definately looks like a truant to me...;) jk
Quoting hcdeubof3:
We did this today and it is pretty cool. Another thing we did was I had him touch both an ice cube with salt and one without. The one with salt was so much colder. This really helped illustrate for my son why people put salt out in the winter to melt the snow.
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- hcdeubof3
on Feb. 7, 2012 at 8:42 PM