There are many places in the world which are short of fresh water. Therefore, many countries are trying to find ways to turn sea water into fresh water. People build many factories to make salt water into fresh.
In some places, people use some ways to heat sea water. These ways will turn salt water into fresh water, but these ways cost much money. Sometimes, people boil sea water with high heat, then a lot of fresh water can be made quickly.
However, heating is not the only way to get fresh water from salt water. Other ways are tried. One way is freezing. The fresh part of salt water freezes first. To get fresh water, the pieces of ice are taken out.
Which method is best? The one that gives the most water for the least money. It may be a different way for each place.
Heating seems very good for small, hot places. It doesn't make very much water at a time and the quality of fresh water is not so good. But the factory is easy to build and costs little. That's why people in many dry places still use this method!
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