Strange Ice cube behavior

So, i've noticed that when I freeze ice cubes these strange icicles appear on the top of the ice. I took a picture, included as an attachment.

Not really sure how something like this forms. Please no speculation.
 

Attachments

turbo

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That is formed by deposition from above. Drip, drip, drip. Think stalagmite.
 
I don't see how, its a freezer...every thing is frozen, so nothing drips from above. Also, its not formed vertically, it is at an angle to the normal.
 

turbo

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If you can come up with an alternate answer (one that does not violate the laws of physics) please feel free. There is only one way that a stalagmite-type extension can form on an ice cube. There could be a number of causes for the dripping, but the method of formation (deposition of liquid water from above and freezing into a column) is not negotiable.
 

russ_watters

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All freezers have defrost cycles, JabberWalkie. There most certainly is liquid water on the walls and ceiling from time to time.
 

DaveC426913

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Not "negotiable"??? Holy Jeez Turbo...

They are not stalagmites. Just because it walks like a duck doesn't mean it's a duck!


They are called Ice Spikes. They are formed as the top layer of water freezes over, leaving a smaller and smaller hole. The expansion of freezing water below this thin layer of ice causes water to bulge up through the hole, where it freezes in a ring.


Physically, if they can be compared to anything, they are more akin to deep sea volcanic vents.


(And I knew this before I looked on Wiki)
 
Last edited:

Gokul43201

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Dave is exactly right. This is just the inverse effect of shrink porosity in metal casting (hence the use of risers).
 

russ_watters

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Wow, I'd never heard of those things either. Learn something new...
 
Nice...

Thanks guys!...i knew it couldn't just be water dripping from the roof.....had a hunch that there was some cool physics going on here. Thanks guys!
 

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