# What happens if your water freezes under 0 atmospheric pressure?

You will have to ask the question differently.When your water freezes it always happens the same.. Then you have ice cream.

At what temperature it freezes or boils when you change the pressure it will give you a little more explanation.

Now water is an interesting thing.What we pull out of the crane is polluted and that water will freeze quickly. But pure water is another story. If there is no pollution to make ice crystals, water can get colder than-1 much colder even.

Who always thought that water freezes at zero degrees: water appears to be able to remain liquid for up to less than 48 degrees Celsius.Something remarkable is happening: the water molecules are grouped in an intermediate form between water and ice crystals, so-called ‘ intermediate ice ‘.

The decreasing pressure – and not the height – causes the boiling point of water to drop from 100 °C at sea level to 69 °C on the highest peaks of Mount Everest.

Also the freezing point of water varies with the pressure, but the changes are very low under the conditions normally prevailing on earth.At the sea level and on top of the highest mountain, water freezes at about zero degrees.

In fact, the freezing point of water only changes significantly if the pressure is about 100 times as high or low as the pressure on the Earth’s surface.On Mount Everest, the pressure is only one third of the pressure at sea level; Therefore, the freezing point of water on the mountain is practically the same.

In a fictional ocean of 25 kilometers deep, the high pressure would mean that the water was liquid to temperatures of around-20 °C. Conversely, water under very low pressure does not have a liquid phase, but it goes directly from gas – water vapour – into ice.In a near-vacuum, where almost no pressure prevails, the water remains gas to temperatures of approximately-70 °C.

How the water behaves at different temperatures and under a varying pressure is also read out to a so-called phase diagram

Maybe not exactly what you mean, the next fascinating experiment.

Take a bowl of water and put it under a strong glass dome, which is connected to a vacuum pump.

We turn on the pump, the pressure drops. At one point the pressure is so low that the water (still at room temperature) the boil. Boiling draws warmth to the water, which cools down thereby. The boiling continues, until the water temperature has fallen to zero degrees; While the water is still boiling, it freezes.

Do you mean under vacuum?In that case there is no water, at least not in equilibrium condition.
In a non-equilibrium situation you could think of an experiment In which you quickly put a quantity of water under vacuum as Evert de Ruijter imagined.You might also think of a vacuum boiler that lets you flow through a small hole. If the water vapor is, you can make a molecular bundle with ultra-cold molecules, but it is probably clusters/droplets/ice crystals. That depends entirely on the conditions, there are also comets of ice, the vapor that comes from the comet is pulled back to the comet by gravity.

Greetings

Arjan