ice floating in water at brim

[imapremed]

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so i saw a post on this and the math on this too, and am wondering this should work for other liquids too right like... say the "ice" form of ammonia and liquid ammonia... or say some other liquid that does not have the negative slope between ice and liquid phase...

also do what substances do you guys know that have the negative slope other than water?

thanks - greatly appreciate this spread of knowledge and this website!

 

[BerkReviewTeach]

so i saw a post on this and the math on this too, and am wondering this should work for other liquids too right like... say the "ice" form of ammonia and liquid ammonia... or say some other liquid that does not have the negative slope between ice and liquid phase...

also do what substances do you guys know that have the negative slope other than water?

thanks - greatly appreciate this spread of knowledge and this website!

As long as ice floats in the other liquid (which is the nly way part of the ice could stick out above the brim) and there is no chemical reaction that takes place between the water and other liquid (which could change the density of the solution), you should see a similar effect. It is especially interesting if the two liquids are immiscible.

 

[imapremed]

but would the ice and liquid have to be of the same compound? like would both have to be of water or both of ammonia etc? - that is what i thought has to be the case.

 

[BerkReviewTeach]

but would the ice and liquid have to be of the same compound? like would both have to be of water or both of ammonia etc? - that is what i thought has to be the case.

Ah, now I get your question. I think ice is the only solid that floats in its liquid form (has a negative slope), so I don't think it would work with anything else.

And now that I think about my previous answer, I disagree with it. If the ice cube was floating in CCl4, it would be about two-thirds submerged with about one-third sticking out above the rim. When the ice melts into water, its volume would be about 90% of the ice cube's volume, which would over flow the two-thirds portion that was displacing the CCl4. It would have to overflow by about 23% of its original volume.

 

[MT Headed]

Most compounds have a positive slope for the solid/liquid line. Therefore the solid form of most substances is more dense than the liquid form, and the frozen solid sinks to the bottom of a liquid lake.

Water is a rare exception.