Warm water freeze faster than cool water?

Answer 1

No. For a lot of reasons, really. But usually, the more matter that exists, the more you need to put into/take from it to incite a change.

If you have a drop of water, you only need get rid of a little energy to freeze it.

If you have a lot, you've got a lot of energy to get rid of.

Let's say we have a deep pond on a cold winter day. The surface will freeze first, why?

1. It's nearer the cold air. The energy from the surface is lost to the air, whereas deeper down you only lose it to other water molecules..so it just stays in the water.

2. Deep down, the water is under a lot of pressure. It's got the weight of the rest of the water on top of it. This crushes the water and makes it slightly more dense.

But ice is less dense than water! So to freeze the water deep down, you have to expand it even though it's being crushed. That's not easy to do. Whereas at the surface, it can - for the most part - just expand into the atmosphere. Which is easy to do.

Further to the above.

No it won't. Shallow water freezes faster. If you live in an area that sometimes gets below freezing (like where I live at the moment - brrr) you'll know that puddles freeze really quickly, but garden ponds still have water beneath the icy surface. This is because water is unique in the fact that it gets less dense as a solid than it is as a liquid. So the solid ice floats leaving liquid below it. Which is good news for fish! This floating barrier also acts as insulation, preventing deeper water from freezing unless the temperature gets really cold.

Answer 2

Hot water can in fact freeze faster than cold water for a wide range of experimental conditions. This phenomenon is extremely counter- intuitive, and surprising even to most scientists, but it is in fact real.

you can see more at:- http://math.ucr.edu/home/baez/physics/General/hot_water.html

The phenomenon that hot water may freeze faster than cold is often called the Mpemba effect. Because, no doubt, most readers are extremely skeptical at this point, we should begin by stating precisely what we mean by the Mpemba effect. We start with two containers of water, which are identical in shape, and which hold identical amounts of water. The only difference between the two is that the water in one is at a higher (uniform) temperature than the water in the other. Now we cool both containers, using the exact same cooling process for each container. Under some conditions the initially warmer water will freeze first. If this occurs, we have seen the Mpemba effect. Of course, the initially warmer water will not freeze before the initially cooler water for all initial conditions. If the hot water starts at 99.9°C, and the cold water at 0.01°C, then clearly under those circumstances, the initially cooler water will freeze first. However, under some conditions the initially warmer water will freeze first -- if that happens, you have seen the Mpemba effect. But you will not see the Mpemba effect for just any initial temperatures, container shapes, or cooling conditions.

Answer 3

This phenomenon is known as the Mpemba effect. It occurs because warm water evaporates faster, reducing the volume of water that needs to freeze and allowing for faster cooling. Additionally, warm water may have fewer dissolved gases that can inhibit ice formation.

Answer 4

d3tThis is a complete guess but I think that it's maybe because the cold gets trapped in the container?

Answer 5

The colder the environment, the quicker heat is transfered from the water to the environment, so yes.

Answer 6

The freezing point is the same.

Answer 7

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