The principle of deicing agent

Release Time:

2022-10-09 16:23

The freezing point of“Chlorine salt” snow-melting agent is below zero after dissolving in water (Snow) . For example, the freezing point of sodium chloride snow-melting agent (the main component of salt) after dissolving in water is around -10 ° C, and the freezing point of calcium chloride is around -20 ° C, the acetic acid can reach about -30 ° C. In addition to absorbing heat, salt also acts as a Freezing-point depression for salt water, making it difficult for ice to form once the salt is dissolved in snow water. In addition, when the deicing agent is dissolved in water, the ionic concentration in water increases, which makes the liquid vapor pressure of water decrease, but the solid vapor pressure of ice remains unchanged. In order to reach a state such as the solid-liquid vapor pressure of the ice-water mixture, the ice melts. This principle can also well explain the reason why salt water is not easy to freeze.

We know that water is a special substance, that is, it becomes less dense when it freezes (it is generally denser in the solid than in the liquid) , so the higher the pressure, the lower the melting point of ice. It is common to see that where the wheels run over the snow tends to melt easily. Snow on the road after the sprinkle of snow-melting agent, and then by the rolling vehicles to make the snow melt more easily. All in all, a dusting of snow-melting agent is good for snow removal.

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