# Thread: Polar Ice Caps Obviously...

1. ## Polar Ice Caps Obviously...

Anyone in the states seen a preview for The Day After Tomarrow where the polar ice caps melt in one day? If not look here:

Still Frames
and
Movie Trailer
The polar ice caps melt and the world floods. Well...doesn't water expand when it is frozen...? So if it melted it would contract? Is this one of holyywood's greatest flaw yet?

2. Floating ice, yes, but the north pole has ice on land.

3. I want to see this, I'm always interested in human endurance storys, this is a new storyline as far as I know.

4. Originally Posted by Magos
Floating ice, yes, but the north pole has ice on land.
No, floating ice doesn't affect the water level in any way.

Water expand when frozen, but the south pole (NOT the north pole) has vast amounts of ice on land. When this ice melts, the water level of the oceans will rise.

5. Originally Posted by Sang-drax
No, floating ice doesn't affect the water level in any way.
That's what I said. Or at least meant...

Originally Posted by Sang-drax
Water expand when frozen, but the south pole (NOT the north pole) has vast amounts of ice on land. When this ice melts, the water level of the oceans will rise.
Oh, i thought it was the north pole that had land and south didn't. I knew one did and the other didn't...

6. >Well...doesn't water expand when it is frozen...? So if it melted it would contract?
Other way around.

7. Okay X, get a bottle of drinking water and take the cap off and fill it completely full and stick it in your freezer and let us know what happens

8. Charles' Law
V1/T1 = V2/T2

If V1 = 10 L; T1 = 250 K; T2 = 300 K;

(10 L * 300 K)/(250 K) = 12 L

(Assuming water) Goes from freezing temp to liquid temp and expands. This is just a gas law I learned in chemistry, so I don't know if it applies to solids and liquids as well

9. Water is peculiar. When most substances change from liquid to solid form, they shrink together, become denser, their molecules packed most closely together.

But when water changes from a sloshy liquid to solid ice, it expands, becomes less dense. Which is why ice floats to the top of your Coke, rather than sinking like a stone to the bottom.

At normal atmospheric pressure, molecules usually behave in predictable ways as their temperature changes. Molecules fly apart into a gas when heated, condense into a flowing liquid when cooled, and shrink into a frozen solid when chilled still further. The changes in state parallel changes in energy: from high energy to medium energy to barely jiggling.
http://www.word-detective.com/howcome/waterexpand.html

Normally, things expand when heated and contract when cooled. Water is an exception to this rule. Even though water does expand when heated and contract when cooled at most temperatures, water expands when cooled and contracts when heated between 4 degrees Celsius and 0 degrees Celsius.

This is why PVC pipes (plumbing) explodes when you allow the water in it to freeze.

10. For all those who care, the movie is based on the book Coming Global Superstorm by Art Bell and Whit Steele (not sure on last name). They didn't write it as pure fiction; they based it on what they believe will happen at current rates and took one story out of that.

11. Thank you RoD! I thought I had made it clear that water was the *only liquid that expands when it freezes! About the floating ice...yes it does effect water levels. Fill a glass COMPLETLEY full and put three ice cubes in it....duh. And, you only see ten percent of a glacier's body because the rest is under water. Does any one know what the highest point of ice is on the south pole?

12. water was the *only liquid that expands when it freezes!
Any liquid with reasonably strong hydrogen bonding will expand when frozen (e.g. ethanol).

About the floating ice...yes it does effect water levels. Fill a glass COMPLETLEY full and put three ice cubes in it....duh.
He means that if you melt floating ice the water levels do not change. So you partially fill your glass with water then add enough ice so that the water level is up to the rim of the glass then you melt the ice and the water level does not change.

13. About the floating ice...yes it does effect water levels. Fill a glass COMPLETLEY full and put three ice cubes in it....duh.
I didn't know that!

14. Originally Posted by loopy
I didn't know that!
You're an idiot!

15. I just found it interesting, I didn't want to start trouble.