Water is most dense at + 4 deg C. The water at the top of the pond will freeze when the temperature at the bottom is 4 Deg C.
Water is most dense at + 4 deg C. The water at the top of the pond will freeze when the temperature at the bottom is 4 Deg C.
As someone has already mentioned it all depends on the triple point and purity. There are no exact temperatures.
Egon
Most ponds I have seen are at atmospheric pressure and without knowing the degree of impurites and dissolved Oxygen, I'll stick with the pond can form ice when the bottom is at ~4 deg C.
When I originally posted this message I never realized all the responses that it would cause. I thought maybe the water purity (such as minerals) in the water can cause its freezing
point to dip below 32F. anyway, the other morning was 21F
and there was no ice at all anywhere on my pond. It tastes great too!
-Shawn
You're correct the addition of ionizing compounds to water will lower the freezing point. One mole of a compound will lower the freezing point -1.86 deg C/mole. A mole is the sum of the atomic weights of the atoms in the compound expressed in grams. For example salt, NaCl has a mole weight of 28 grams (11+17).
28 grams of salt mixed in 1000 grams (1 Liter) will lower the freezing point to -1.86 deg C.
I doubt that your pond has a significant ionic content. When your pond just freezes drop a temperature probe to the bottom and if your still dry, let me know what you get.
If it gets below 32 at a pond in the woods and nobody is there to see it, does it freeze?
Alan L. - Texas
North of Mustang
South of Bugtussle
On the Banks of Buck Creek
<font color="blue"> If it gets below 32 at a pond in the woods and nobody is there to see it, does it freeze? </font color>
Depends if there's a bear in the area. [img]/forums/images/icons/tongue.gif[/img]
OK, a few days ago, the temps outside where below
10F. My big pond had ice about 2 inches thick, but
the small one wasn't even the slightest bit phased
by the temp. There wasn't even any ice around the sides.
Some my say, if must be the ground water temp and
its just too warm there. Ok, if this is true but further
down the path of where the small flows downhill, nothing
was frozen. I have a few other springs, and they were
froze almost 10 feet from the opening, but this wqas at least 100 feet away. I didn't bother walking down more to see
if it was going to freeze at some point.
Maybe this isn't water at all but a moonshine still opening [img]/forums/images/icons/ooo.gif[/img]
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