What's with the salt and deicer?

If the snow on the road is not cleared in time, it will turn into ice, which will bring danger to the moving cars, so it should be cleared.

The freezing point of normal water is 0℃, but after adding salt (NaC 1, not necessarily salt), the freezing point of water drops below 0℃, which is the reason for spraying salt to melt snow. However, this has two disadvantages. First, the freezing point is limited, and it makes no difference if the weather is too cold. Second, salt is corrosive to roads, and long-term use will damage the pavement.

So now many cities are using special snow removal machines. The effect of snow remover and salt on lowering the freezing point of water is similar, but the specific implementation process is still different. Mainly through the water absorption of deicing and snow removal agent and a large amount of heat release during melting, the structural lattice in snow is dislocated, which leads to the melting of ice and snow. When the snow melts, it absorbs heat, which makes the surrounding temperature drop. At this time, the vapor pressure of the solution is less than that of ice and snow. In order to achieve a new balance, the ice and snow are constantly melting to form a solution, thus lowering the freezing point of water. Under the condition of low temperature, the balance process of the above complex actions is repeated, which is the principle of snow melting and snow removal by snow remover.