Ice (chemical formula: h? O) is one of the 12 crystal forms of solid water, with cold transfer and low temperature. There are three states of water in nature: gas, solid and liquid.
We call liquid water at normal temperature and pressure, gaseous water is steam, and solid water is ice I-H, where H stands for hexagon. At standard atmospheric pressure, the melting point of ice is 0℃, and the heat of fusion is 3.35×10.5j/kg.
Under the heavy pressure of 0/46 tons per square meter/kloc, ice I-H is transformed into ice II, and 3400 tons is transformed into ice VII. Due to pressure, when the temperature is as high as 150~200℃ and reaches-165℃, ice VII is formed, which is not good for health and should not be too much.