how to make hot ice
 

http://www.youtube.com/watch?v=aC-KOYQsIvU&feature=fvw
pretty cool...i wanna try...

thats cool!

but how did he pour it into a tray and then touch it to freeze it, then the next instant he just pours it out and its instant ice?

edible as well?

i'm gonna make this and pour it on someone

LOL, at 1:50, it looks like a double penetration dildo.

I have a dirty mind.

pretty sure its not edible dude lol

thats pretty cool I wanna try that I wonder if you can eat it ?

Would you really eat hand warmers?

this the same stuff in the heat packs? can you activate those packs by simply disturbing them? whats the metal plate inside for

any one know where to get this locally?

From the video description:

It's not ice. What's formed is a sodium acetate crystal.

If you do this, you'll find that you can dissolve a shitload of the salt into hot water. The solution created is supersaturated with sodium acetate and crystals will form if given the opportunity... they usually need a place to start crystallizing, so a little bit of sodium acetate or perhaps a speck of dirt on that guy's hand is enough to get the crystallization started. There was probably "something" in the pan to get the crystallization started. It doesn't take much.

Sodium acetate can be purchased from a scientific supply company. Might also be available at teacher-type stores.

arent there like these hot packs where u crack a piece of metal and it turns to "hot ice" instantly? and when it gets cold just boil it and i'll go back to liquid

I remember doing something like this back then in high school during Chemistry class :D.

that looks really cool.. probably not edible though

wow can be usefull at time.

I'm going to put the freeze into Gotham!

that is trippy

wow dude, the shit you learn on rs XD

:teach:

i think the metal plate is warm or heated to cause an instant reaction

Technically, it's not dirt but the salt from peoples skin. There's a tiny spec of salt that will most likely trigger this effect (forgot what it's called) since sodium acetate is a form of salt anyway.

The effect you're referring to - precipitation?

I think in this case it's just "crystallization"...haha

You can try this at home with salt, so there's no need to buy some chemical compound. Boil water with salt and you create a perfect equilibrium of particles. When you drop a spec of salt in this liquid, you disturb equilibrium and that spec of salt will cause collisions to form a solid.

In simpler terms, imagine you're in tokyo and there's no room to move, but there's just a perfect amount of space where you can stand and not touch anyone. Add 1 extra person into this perfect crowd, and everyone will start a chain reaction and push each other.

Seeding. Seed crystal. The seed doesn't even have to be a salt. A grain of sand is probably enough as it provides a surface for crystallization to occur.

Use the thank button ;)

You can't do this with table salt. Table salt doesn't form a supersaturated solution, while Sodium Acetate does. A supersaturated solution of sodium acetate is (physically) unstable.

This is not an equilibrium situation.

Do want try