Register to reply

Why do ice cubes stick together?

by zacsee2000
Tags: cubes, stick
Share this thread:
Sep15-08, 02:52 PM
P: 1
I've noticed that when I pour myself a glass of ice water the ice cubes will stick together. I put them in my glass as individual cubes, and they seem to melt together where they touch each other. Can anyone explain why this happens? Thanks.
Phys.Org News Partner Physics news on
Scientists uncover clues to role of magnetism in iron-based superconductors
Researchers find first direct evidence of 'spin symmetry' in atoms
X-ray laser probes tiny quantum tornadoes in superfluid droplets
Sep16-08, 05:08 AM
HW Helper
P: 2,616
I'm guessing it's because applying pressure (due to the weight of the cubes) causes it to melt, but that it refreezes when water is poured into the glass. When it refreezes, it does so in contact with the other cubes so it sticks together.
Andy Resnick
Sep16-08, 07:30 AM
Sci Advisor
P: 5,517
It could also be that a thin layer of water condenses on the cubes from the air and this freezes, sticking the ice cubes together.

Shooting Star
Sep16-08, 05:43 PM
HW Helper
P: 1,979
Why do ice cubes stick together?

Hi zacsee2000,

You have to describe in a slightly greater detail as to how you pour the glass of ice water. Once you are saying that the cubes stick together, but then you say that they melt when they touch each other. Do they also stick together side by side? Do you put the water afterwards?

Defennder has interestingly explained it through regelation, but I doubt if a single ice cube will exert too much of a pressure on a lower one to cause sufficient melting and re-freezing .

Andy's explanation seems better because the temperature of the ice cubes when you take them out of the icebox (-20 C) is much lower than the room temperature. Water will definitely condense on the boundary, but are the ice cubes cold enough to "freeze" that water again?

So, a detailed description of what happens when you put them together without water would be helpful. (In the meantime, I can see myself taking too much of iced beer -- well, anything for a good cause...)
Sep16-08, 06:15 PM
P: 29
It is possible that they just keep close because of surface tension. You would require some force to drag them apart because of water between them, so cubes stick together in their local energy minimum.

Register to reply

Related Discussions
Sum of the first n cubes Calculus & Beyond Homework 3
Magic Squares & Cubes Set Theory, Logic, Probability, Statistics 1
Spivak on 1-cubes Calculus 0
Two Cubes in 3d Fun, Photos & Games 12
Square Cubes Linear & Abstract Algebra 7