Water doesn't have to freeze until -48 C (-55 F)

We drink water, bathe in it and we are made mostly of water, yet the common substance poses major mysteries. Now, chemists may have solved one enigma by showing how cold water can get before it absolutely must freeze: 48 degrees below zero Celsius (minus 55 Fahrenheit).That's 48 degrees Celsius (87 degrees Fahrenheit) colder than what most people consider the freezing point of water, namely, 0 C (32 F).Supercooled liquid water must become ice at minus 48 C (minus 55 F) not just because of the extreme cold, but because the molecular structure of water changes physically to form tetrahedron shapes, with each water molecule loosely bonded to four others, according to the new study by University of Utah chemists Valeria Molinero and Emily Moore.The findings suggest this structural change from liquid to "intermediate ice" explains the mystery of "what determines the temperature at which water is going to freeze," says Molinero, an assistant professor at the University of Utah and senior author of the study, published in the Nov. 24 issue of the journal Nature. "This intermediate ice has a structure between the full structure of ice and the structure of the liquid," she adds. "We're solving a very old puzzle of what is going on in deeply supercooled water."However, in the strange and wacky world of water, tiny amounts of liquid water theoretically still might be present even as temperatures plunge below minus 48 C (minus 55 F) and almost all the water has turned solid -- either into crystalline ice or amorphous water "glass," Molinero says. But any remaining liquid water can survive only an incredibly short time -- too short for the liquid's properties to be detected or measured.How and at what temperature water must freeze has more than just "gee-whiz" appeal. Atmospheric scientists studying global warming want to know at what temperatures and rates water freezes and crystallizes into ice. "You need that to predict how much water in the atmosphere is in the liquid state or crystal state," which relates to how much solar radiation is absorbed by atmospheric water and ice, Molinero says. "This is important for predictions of global climate." Liquid water is a network of water molecules (each with two hydrogen atoms and one oxygen atom) held loosely together by what is called hydrogen bonding, which is somewhat like static cling. Molinero says that depending on its temperature and pressure, water ice has 16 different crystalline forms in which water molecules cling to each other with hydrogen bonds. Molinero says that "what makes water so strange is that the way liquid water behaves is completely different from other liquids. For example, ice floats on water while most solids sink into their liquid forms because they are denser than the liquids." Water's density changes with temperature, and it is most dense at 4 C (39 F). That's why fish survive under ice covering a pond by swimming in the warmer, denser water at the bottom of the pond.But the property of water that "is most fascinating is that you can cool it down well below 32 degrees Fahrenheit [zero Celsius] and it still remains a liquid," says Molinero. Liquid water as cold as minus 40 C (minus 40 F) has been found in clouds. Scientists have done experiments showing liquid water can exist at least down to minus 41 C (minus 42 F). Why doesn't water necessarily freeze at 0 C (32 F) like we were taught in school? "If you have liquid water and you want to form ice, then you have to first form a small nucleus or seed of ice from the liquid. The liquid has to give birth to ice," says Molinero. "For rain, you have to make liquid from vapor. Here, you have to make crystal [ice] from liquid." Yet in very pure water, "the only way you can form a nucleus is by spontaneously changing the structure of the liquid," she adds. Molinero says key questions include: "Under which conditions do the nuclei form and are large enough to grow?" and "What is the size of this critical nucleus?" Molinero says that "when you cool down water, its structure becomes closer to the structure of ice, which is why the density goes down, and this should be reflected in an increased crystallization rate." Supercooled water has been measured down to about minus 41 C (minus 42 F), which is its "homogenous nucleation temperature" -- the lowest temperature at which the ice crystallization rate can be measured as water is freezing. Below this temperature, ice is crystallizing too fast for any property of the remaining liquid to be measured.