Well, here is some cold facts that you may be interested in about cold. Nice play on words right there.
How cold is the coldest bottle of drink or water you had last time? If it was so cold, it set your teeth on edge with ice on it, that would be said to be an icy drink. So you could have had a drink at temperature of 0-degree Celcius
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The temperature at which water turns to ice is 0 degrees Celsius (32 degrees Fahrenheit) and below. But that is not always true for water can be a liquid and still cooled below 0-degree Celcius. Even though water freezes at 0 degree Celsius that is not its coldest form as a liquid. Water indeed has some weird property.
Scientists have been able to supercool water down to a temperature of around 229 Kelvin. That is about -45 degrees Celsius or -50 Fahrenheit.
If some conditions are in place, the researchers have demonstrated their ability to push the limit of cool on a liquid without its freezing as it usually does at 0 degrees Celsius.
One of the conditions for not freezing at 0 degrees Celsius is that the water would be extremely pure and free of seeds for ice crystallisation.
For water to freeze, it requires forming a small nucleus called seed that enables the molecules to create crystals. But water free from these nuclei can get extremely cold and not form crystals.
The Cooling Experiment
The thermodynamics of temperature or absolute temperature is that theoretical temperature at which the particles of matter is at its lowest energy or ground state. This is the state of minimal movement of particle constituent and the point it can no longer get colder.
At the absolute zero state, there are zero kinetic energy of particles which constitutes the matter. The temperature of a matter is dependent on the kinetic energy of its molecules. The faster they move, the higher the temperature. The slower they move, the lower the temperature.
That brings us to freezing. If the water kinetic energy slows down so much, it begins to attract the neighbouring molecules to form a crystal. Water that is below 0 degree Celsius in default mode freezes.
The researchers needed to walk around this default state of water.
The X-ray Probe to the Rescue
The scientists have this knowledge of supercooling water well below 0 degrees Celsius without its freezing. Scientists can push water to the -38 degrees Celsius, but the extreme crystallisation that follows makes studying its structural information as a liquid and getting reliable information impossible at below this point.
To bypass this no man's land the scientific team made use of an X-ray laser called LCLS (Linac Coherent Light Source) to measure the structure of the water drops.
Probing the water
The liquid injector shoots liquid water into a vacuum chamber. The water is rapidly evaporated bringing about cooling. Some of the droplets form into ice, but some remain as a liquid to and can be studied.
As the water is injected, it passes through an X-ray laser emitting pulses at the extremely rapid rate of 50 femtoseconds or 50 quadrillionths of a second. The scientist can now adjust the water temperature by changing the travel time of the droplets before the X-ray laser hits it.
The scientist can now study the diffraction of the pulses of the supercooled water droplets (cooled up to 229 Kelvin) to check the structural composition of the droplets.
That means the scientists has successfully entered into the no man's land of a supercooled liquid and also being able to check the molecular structure of the water.
Relevance of this breakthrough
The more the molecular structure of a supercooled liquid is studied, the more it clears up the scientific debate of whether there is a more state of water apart from the standard three- solid, liquid and gas.
The debate explores if at critical temperature if there exist two different states of liquid with unique physical properties such as density and compressibility.
Though before now the computer modelling of water is available for water under 41-degree Celcius, this method allows for the lower temperature of water to be studied.
This breakthrough does not solve the debate, but it offers more tools to check if the critical point for such behaviour exists in water.
Water is still an essential liquid, and a study of its properties are necessary to ascertain how liquid cold water can behave under certain conditions.
In nature, we have supercooled water drops in the upper atmosphere of the earth. Deciphering its nature could help understand more how ice form in the atmosphere.
References
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