0
Generally water freezes at 0 C and depth does not matter. Usually, water freezes first at the top, because ice floats, so that might make it appear as though deeper water is not freezing at the same time. At extraordinary depths (oceans or deep lakes) the freezing point of water is slightly lower but that is beyond the experience of daily life. See explanation that follows.
Long Answer:
Important Points:
1. Water under pressure freezes at a lower temperature.
2. In Natural bodies of water, cooling occurs at the surface.
3. Ice floats. The maximum density of water occurs at 4 degrees C.
Answers:
1. Pure water freezes at 0 degrees C and one atmosphere of pressure. Increased pressure decreases the freezing temperature.
Under pressure, water freezes at a slightly lower temperature, but one needs about 135 times atmospheric pressure to decrease the temperature of freezing by even one degree Celsius and that requires a depth of more than a kilometer so it is not particularly relevant to normal lakes
. It is relevant in the ocean. (The salt in the ocean changes the freezing temperature too, but the qualitative fact is still correct that at depths of a kilometer the freezing temperature decreases by almost a degree.)
2. Normally water freezes at the same temperature (0 C) at the top and the bottom but freezing proceeds from the top down because the top gets colder first.
Once a body of water reaches 4 degrees C, the water that is cooled below 4 degrees is lighter, i.e. buoyant, and tends to go to the top, leaving the densest water, which is the warmest water, at the bottom.
A natural body of water, like a lake, loses heat energy through its surface. In a relatively still lake, the surface of the lake begins to freeze at 0 Centigrade, but the water at the bottom is at 4 Centigrade.
(If water is mixed so that its temperature is nearly uniform throughout, then water just freezes from the outside inward where "outside" really means which ever sides the heat is being removed from.)
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
Why surface of water freeze at 0 but under water not freeze even at 4c?
Because 4 degrees Celsius is higher than 0 degrees Celsius
Why doesn't surface ocean water not usually freeze at 0 degrees celsius?
Because it's actually moving water it doesn't seem to freeze until -10
How will water freeze?
water will freeze when it is at its freezing point which is 0 degrees
How does ice melt at 0 degrees and water freeze at the same temperature?
ice melt at 0 degrees and water freeze at the same temperature because it cool like that. xDThe real answer is because molecules of ice are constantly escaping into the water (melting), and molecules of water are being captured on the surface of the ice (freezing).
What is the freeze point in Celsius?
The freeze point of water? 0 degrees.
What temperatere does water freeze and boil at?
Freeze : 0 Boil : 100
When does water freeze and boil Celsius?
Freeze=0 Boil=100
Why is the surface temperature of an iceberg is always 0 degrees celsius?
The temperature required for water to freeze is 0 C , so you would expect an iceberg to be no greater then 0 C but there is no reason why it can't be less then 0.
What tempreture does water freeze at?
The temperature 0
When does ice freeze on Celsius scale?
The freezing point of water is 0 degree Celsius.
Why Lakes Only Freeze on The Surface?
to freeze water it has to be at least 0 degres celcius. if it was -10 degres celcius then the water in a lake might only freeze 2 cm. the colder it gets the thicker the ice becomes but in this contry, or any other contry, it will never become cold enough to freeze all of the lake right down to the bottom.
What tempo does water freeze at?
0 degree Celsius.
