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Reading Selection, Lesson 18

Changing Freezing and Boiling Points

salt storage building

Do you know what is inside the strange building shown in this photograph? The building is used to store salt that is spread on the road when weather conditions are below the freezing point of water. What effect will the salt have on icy roads? Why store the salt in a building?




snow plow clearing snow on a street



This truck removes snow and spreads salt. How does spreading salt on roads reduce accidents?





Antifreeze being poured into a car's radiator.


A solution of antifreeze is used to fill car radiators. It lowers the freezing point of the water in the radiator of the car. It also raises its boiling point and reduces corrosion. Why are the properties of this solution useful to motorists? Why isn’t salt used instead?

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