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Snow melting agent, as the name implies: refers to the medicine that can lower the melting temperature of snow and ice. Deicing agent melts the snow on the road by lowering the melting temperature of ice and snow, facilitating road dredging, and the spreading effect is obvious, but it is harmful. Research has found that the residue of deicing agent can corrode the road surface and automobile rubber tires. At present, the northern part still uses sand and snow shovel as the main method in winter, and snow melting agent is the supplementary method to remove ice and snow on the road to ensure smooth traffic. The snow melting agent melts the snow fast, let's understand the snow melting principle of the snow melting agent together.

The freezing point of snow melting agent (the main component of table salt) is -10℃ after being dissolved in water, calcium chloride is around -20℃, and acetic acid can reach around -30℃. The freezing point of salt water is lower than that of water, so it is difficult to form ice cubes 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, causing the liquid vapor pressure of water to drop, but the solid vapor pressure of ice remains unchanged. In order to achieve the solid-liquid vapor pressure of the ice-water mixture, the ice melts. This principle can also explain the reason why salt water is not easy to freeze. Simply put, the snow melting agent lowers the melting point of snow, making it easier to melt.

Water is a special substance, that is, the density becomes smaller after freezing (generally, the density of a substance in a solid state is greater than that in a liquid state). Therefore, the greater the pressure, the lower the melting point of ice. It is often seen that the snow is easy to melt where the wheels run over. After being sprinkled with snow-melting agent on the snow-covered road, it is easier to melt the snow after being crushed by vehicles.

The snow melting agent has a small dosage and low cost. Encourage the promotion of the use of environmentally friendly deicing agents, and consider granting appropriate economic subsidies to make up for the price disadvantages of environmentally-friendly deicing agents, and realize that inorganic deicing agents are replaced by new, affordable and environmentally friendly deicing agents.

Snow melting principle of snow melting agent