The principle of snow melting of "chlorine salt" snow melting agent is: "chlorine salt" snow melting agent is dissolved in water (snow), its freezing point is below zero, for example, sodium chloride (the main component of salt) dissolved in water after freezing point - At 10 ° C, calcium chloride is around -20 ° C, and acetic acid can reach about -30 ° C. The freezing point of the brine is lower than the freezing point of the water, so that it is difficult to form ice again after the salt is dissolved in the snow water. In addition, after the snow melting agent is dissolved in water, the ion concentration in the water rises, so that the liquid vapor pressure of the water decreases, but the solid vapor pressure of the ice does not change. In order to reach the state of the solid-liquid vapor pressure of the ice-water mixture, the ice melts. This principle also explains well the fact that salt water is not easy to freeze. Simply put, the snow melting agent reduces the melting point of the snow, making it easier to melt.
We know that water is a special kind of substance, that is, the density becomes smaller after freezing (the density of a solid in a solid state is greater than the density in a liquid state), and therefore, the greater the pressure, the lower the melting point of ice. It is often seen that snow is often easily melted where the wheels run over. After the snow melting agent is sprinkled on the snowy road surface, the snow is melted by the rolling of the vehicle.
In summary, it can be beneficial to remove snow after sprinkling with snow melting agent.