If you live in a city that regularly receives heavy snowfall, you also know why in winter there are big de-icer trucks sprinkling salt on the roads. But how does sodium chloride to melt the ice Who draws the roads?
In reality, it is rock salt, not sea evaporation salt used (di mining). Precisely because of its “rocky” origins, the latter still have impurities, which is why it is brown or gray.
When the temperature drops below 0°C, the water solidifies, forming a light layer of ice on roads and pavements. It starts a process called “road salt”.freezing point drop”: Water with 10% salt concentration freezes at -6°C, while a 20% solution solidifies at -16°C.
For freezing point drop to work, there should be at least some water on the way. In anticipation of snowfall, observing private vehicles emitting a mixture of water and salt will have come true. it’s no use scattering salt on dry roads. Therefore, preventing roads from freezing is essential in many aspects, primarily environmental (reducing the number of vehicles that can defrost later).
Rock salt is one of the most widely used road antifreezes, but it also has its flaws. If the road temperature is below about -9°C, salt will have no effect on ice In these pre-existing situations, trucks sprinkle sand over frozen water to gain traction. It should also be counted among the impurities emitted along with rock salt. Both lead and phosphorus.
Without going off topic, do you know what dry ice is?
Source: Every Eye