In cold County , ice piled on roads is removed by sprinkling brine solution .explain the principal involved .
Answers
As your city works to clear snow and ice from the roads, you may have noticed trucks spilling salt or sand on the road. That's no accident! It's all part of the plan.
In warm water, molecules move quickly and freely, making liquids fluid and able to adapt to any shape of container you pour them into. As water freezes, though, molecules begin to move more slowly. Eventually the molecules begin sticking together to form ice, a process we call freezing.
When you put salt on ice, liquid water molecules that have not yet frozen on the surface of the ice dissolve a bit of the salt, creating a sort of saltwater solution called “brine." The brine prevents the liquid water molecules from freezing.
As more water molecules begin to speed up and break free from the ice, they turn into liquid and dissolve even more of the salt.
Why does this happen? Salt lowers the freezing point of water. Ice forms when water is cooled to 32° F (0° C). When you add salt to water, the freezing point drops.
If you add a 10 percent salt solution, the freezing point drops to 20° F. A 20 percent salt solution freezes at 2° F.
If you have ever sprinkled salt on your icy front porch steps, you already know you can watch this process in action. When you sprinkle salt on ice, you will notice that it begins to dissolve immediately around each grain of salt.