What is ice 7? How many kinds of ice do we usually have?

Speaking of ice, I believe everyone will think it is very common in daily life, but this is not the case. In fact, there are many kinds of ice, and the ice we usually see in cold drinks is just one of them. So far, 18 kinds of ice have been found, among which No.7 ice is famous for its danger. If there are no seven pieces of ice in the ocean, the whole ocean will freeze. Because it can spread rapidly, reaching 1600 kilometers per hour, even if the whole ocean freezes in a short time, it is no joke.

First, let's take a look at what ice block 7 is. In physics, ice exists in the solid form of water and belongs to the crystallization formed by the orderly arrangement of water molecules under certain conditions. Each water molecule can combine with the other four water molecules in the crystal. This behavior can be simply understood as that water molecules combined in this way can make water form various crystals under different conditions. Ice 7? In fact, it is just one of the crystal forms. This solid crystal structure can withstand extremely high temperatures, but when the temperature reaches a certain value, No.7 ice will also melt under high pressure. It belongs to the common substances on the earth. When it comes to danger, it is because it is difficult to control and it is easy to cause harm to many creatures. Water has fluidity, is composed of water molecules, and is a freely deformable fluid. Solid matter does not voluntary movement, but vibrates in situ. As we all know, the greater the pressure, the greater the pressure required to form the No.7 ice block in the deep layer under the earth's surface. So the No.7 ice will form in a specific area deep in the earth. No 7 ice was formed under great pressure. When the temperature rises to about 1000, No.7 ice will dissolve in liquid water. If enough pressure can be applied continuously, water molecules will be compressed and the degree of freedom will be reduced. But don't worry too much. No.7 ice can't exist forever under normal pressure. Take No.7 ice at normal temperature and pressure and apply at least 20,000 times the standard atmospheric pressure to become No.7 ice. Therefore, No.7 ice is not unusual, but a crystal structure that emerges under great pressure.