In a certain range, cold water melts quickly and heat transfer is fast at low temperature. But this is not certain. When we analyze this problem, many people will think of temperature. However, is the problem of melting or freezing only caused by a single variable, temperature? Have we considered the surrounding environment, evaporation and different temperatures?

Pure water in nature will freeze at 0℃ under normal atmospheric pressure. If water contains impurities, the freezing point of water will decrease with the increase of pressure. The melting point of ice is the freezing point of water. With the increase of atmospheric pressure, the melting point of ice also increases.

Extended data:

physical features

Ice is a transparent hexagonal crystal structure. Pure water will freeze at 0℃ under normal atmospheric pressure. If water contains impurities, the freezing point of water will decrease with the increase of pressure, and the melting point of ice is the freezing point of water. With the increase of atmospheric pressure, the melting point of ice will also increase.

The melting heat of ice is 33 1.6 ~ 335.7 kJ/kg, usually 335 kJ/kg. The specific gravity of ice is related to its temperature, environmental pressure during ice formation, whether there are bubbles in ice and the purity of water. When water freezes, its density decreases and its volume increases.

Generally speaking, when the temperature of ice ranges from 0℃ to -20℃, its average specific heat capacity is 2.1kj/kg k, while that of water is 4.2 kj/kg k, which is only half of that of water. The thermal conductivity of ice is related to its temperature and increases with the decrease of temperature.

Baidu encyclopedia-ice cube