Wow! that is very interesting. I thought that the temperature must have been
low enough to freeze water that was on the move, perhaps water that was already
supercooled but had no nucleus on which to freeze, but I had never heard of the
results of such expansion.
Chris
> On 20 Dec 19, at 18:03, Wayne Shumaker <om3ti@xxxxxxxx> wrote:
>
> Close, according to this
> https://en.wikipedia.org/wiki/Ice_spike
> as the water freezes the last remaining unfrozen spot is where the ice tower
> forms.
> Just think of it as nature's way of preserving your birdbath from cracking.
>
> WayneS
>
> At 12/20/2019 08:51 AM, Jim wrote:
>
>> No such luck, Charlie.
>>
>> Brian Reid, who owns and supports the Leica Users Group site, gave the best
>> suggestion. It's really about the physics of freezing of a contained
>> liquid. He suggests that the surface of the bird bath froze, trapping the
>> liquid below. When it continued to freeze, the expanding slush found a
>> weak spot in the ice and pushed upward. To me, it is similar to what I
>> recall when milk was delivered in glass bottles. In freezing weather, the
>> freezing milk on the front porch would push out the cardboard cap and lift
>> it on a column of frozen milk.
>> h
>> By the way, there is a smaller one this morning, on the opposite side of the
>> bird bath.
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