Water seems to be able to be seen through at a glance, but it\'s really not easy
Science and technology daily, Beijing, September 21 (reporter Liu Xia) - researchers from the Pacific Northwest National Laboratory (PNNL) of the U.S. Department of energy pointed out in the latest issue of science magazine that after their first measurement of ultracold water, they found that at the extremely low temperature of minus 80 degrees Celsius, water exists in liquid form and is composed of two liquids. The latest research has increased our deep understanding of water and helped scientists explain why liquid water can exist on frozen planets such as Jupiter and Saturn.
Researchers point out that scientists have so far made a number of assumptions about the behavior of liquid water at the most extreme temperatures. For example, some scientists want to know whether water can exist as a liquid at a very low temperature of minus 83.15 degrees Celsius. It's very important to clarify these issues, because water covers 71% of the earth's area. A deep understanding of water is crucial for us to understand how it regulates the environment, our bodies and even life itself.
PNNL chemical physicist Greg Kimmel said: "our research shows that at extremely cold temperatures, liquid water is not only relatively stable, but also a mixture of two structures."
For 25 years, Kimmel and colleague Bruce Kay have been studying the bizarre behavior of water. They put forward various models to explain the abnormal characteristics of water. In the latest research, using infrared spectroscopy technology, they have successfully observed the freezing motion of water molecules when a thin layer of ice is destroyed by a laser, creating ultra cold liquid water that lasts only a few nanoseconds.
New data from their freeze frame "snapshot" of supercooled water show that supercooled water can condense into a dense, liquid like structure. The higher density structure coexists with the lower density structure. As the temperature drops from - 28.15 ℃ to - 83.15 ℃, the proportion of high-density liquid decreases rapidly, indicating that the water at - 83.15 ℃ is composed of two structures.
Kimmel said the study may help explain how graupel forms. Before a cold snowstorm, sometimes small white fluffy particles fall from the sky, which is called graupel. Their research shows that graupel is formed by the interaction between snowflakes and supercooled liquid water in the upper atmosphere.
These studies may also help to understand how liquid water exists on the frozen planets of the solar system - Jupiter, Saturn, Uranus and Neptune; In addition, the ultra cold water vapor also formed a striking tail behind the comet.
Researchers say the new research can reveal the behavior of liquid water in a closed environment, and in the future they can use the technology used in this research to track how molecules rearrange behind various chemical reactions.
Science and technology daily, Beijing, September 21 (reporter Liu Xia) - researchers from the Pacific Northwest National Laboratory (PNNL) of the U.S. Department of energy pointed out in the latest issue of science magazine that after their first measurement of ultracold water, they found that at the extremely low temperature of minus 80 degrees Celsius, water exists in liquid form and is composed of two liquids. The latest research has increased our deep understanding of water and helped scientists explain why liquid water can exist on frozen planets such as Jupiter and Saturn.
Researchers point out that scientists have so far made a number of assumptions about the behavior of liquid water at the most extreme temperatures. For example, some scientists want to know whether water can exist as a liquid at a very low temperature of minus 83.15 degrees Celsius. It's very important to clarify these issues, because water covers 71% of the earth's area. A deep understanding of water is crucial for us to understand how it regulates the environment, our bodies and even life itself.
PNNL chemical physicist Greg Kimmel said: "our research shows that at extremely cold temperatures, liquid water is not only relatively stable, but also a mixture of two structures."
For 25 years, Kimmel and colleague Bruce Kay have been studying the bizarre behavior of water. They put forward various models to explain the abnormal characteristics of water. In the latest research, using infrared spectroscopy technology, they have successfully observed the freezing motion of water molecules when a thin layer of ice is destroyed by a laser, creating ultra cold liquid water that lasts only a few nanoseconds.
New data from their freeze frame "snapshot" of supercooled water show that supercooled water can condense into a dense, liquid like structure. The higher density structure coexists with the lower density structure. As the temperature drops from - 28.15 ℃ to - 83.15 ℃, the proportion of high-density liquid decreases rapidly, indicating that the water at - 83.15 ℃ is composed of two structures.
Kimmel said the study may help explain how graupel forms. Before a cold snowstorm, sometimes small white fluffy particles fall from the sky, which is called graupel. Their research shows that graupel is formed by the interaction between snowflakes and supercooled liquid water in the upper atmosphere.
These studies may also help to understand how liquid water exists on the frozen planets of the solar system - Jupiter, Saturn, Uranus and Neptune; In addition, the ultra cold water vapor also formed a striking tail behind the comet.
Researchers say the new research can reveal the behavior of liquid water in a closed environment, and in the future they can use the technology used in this research to track how molecules rearrange behind various chemical reactions.
