Advice on fair project.

[hell7fire1]

did you know dry ice is solid carbon-dioxide,its called dry ice because it doesn't melt into water,it goes straight into gaseous  state.

[juan_de_diablo]

did you know dry ice is solid carbon-dioxide,its called dry ice because it doesn't melt into water,it goes straight into gaseous  state.

Yup, so what happens if you put it in super cooled water??? Does it explode? Does it cause the water to freeze due to the addition of non-h2o molecules? Does it just make fog like dry ice in normal water???

[Xenocidius]

Well, the water would immediately begin freezing due to the disturbance. If you managed to submerge the dry ice completely before that happened, then you'd have dry ice frozen in water. The dry ice would then start subliming; if the CO2 was unable to escape it might be able to make the ice explode or at least crack.

If supercooling water is impractical, you could try supersaturation (dissolving more solute in a solvent than should be allowed by the current temperature of the solution). It's fairly easy and also quite spectacular.

[Ilias22]

I am the only who prefer maths from science  ...i am also good in science but i prefer maths because they are a bit easier...

There's not much to present for pure mathematics except pages and pages of rigorous proof. It's easier if you have 1337 experience with animated graphics and doing something like geometry, but otherwise, I'd stay away from these types of stuff for a science fair.
As for applied mathematics (statistics/modeling)...Psh, I'd rather do science (physics).

We had a "highschoolers-show-elementary-schoolers-science" fair last year, and the best project by far was a liquid nitrogen cannon 8) that shot potatoes. It was built with bathroom piping and powered by placing liquid nitrogen into water bottles. That's right. It was a real-life DIY derptater cannon.

Super-cooled water? I've seen some youtube videos on that stuff, so it should be awesome enough. But if you wanted something more "explosive"... super-heated distilled water ftw. 8)

By this way it is better... I was always good in physic  and maths but from my first day at school i love maths...Thats why i prefer maths..Also i have better marks in Maths...i ussually get 19/20 and in science arround 17/20 but i hate geometry(angles etc)and i prefer algebra(NUMBERS etc.)

[AnonymousRevival]

Typically an ionic solution would have a lower freezing point, so it could retain liquid even if it is below zero.

[thispersonisagenius]

Dang, you picked the science project. It's very interesting, though.
On a side note, being pretty good at math (if I do say so myself), there are many interesting math projects you could do. Just a couple examples are fractals (yes, the card, but also a very interesting mathematical concept) and telescoping sums/products (you should look these up).
It saddens me that people find math to be something boring that you can't do an interesting project on.

[hell7fire1]

thanks for all your help guys,also,I am still looking into the math projects cause my friend who did take the math project may or may not need ideas(his words).

[Sqantic Pilau]

Oh,did I mention it was super cooling water?
You cool pure water to a temperature at or just bellow 0 degrees,it will still be in liquid form as there is not enough energy to alter the bonds between the molecules,as soon as the water is disturbed,shaken, slammed on to a desk or poured onto a piece of ice.
The water will freeze as it will absorb the kinetic energy transferred into it.
/quote]

Make sure you fully research the physics of this - I always thought it was due to shockwaves acting as (previously absent) nucleation sites.
I'm not saying I know for sure your explanation is wrong - but taken to the extreme wouldn't your explanation imply no lower limit to the temp. at which supercooled water could exist ?