A project with salt water and ice
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Salt Water and Ice

Salt Truck
A salt truck spreading salt on the road

You can easily see that salty water freezes at a different temperature than fresh water. If you live somewhere where it gets cold in the winter, you probably already know that you put salt on the sidewalk to melt the ice so people can walk on it.

If you don't, though, you can test this out by filling two cups with water and putting a spoonful or two of salt in one of them. Stir, and put both cups in the freezer. How long does it take each of them to freeze? Does it make a difference if there is even more salt in the water?

The reason water takes longer to freeze when it is salty is that the salt molecules get in the way of the water molecules when they try to form regular ice crystals.

More about salt
Salt in human history

Bibliography and further reading about salt:

More about sedimentary rocks
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Karen Carr is Associate Professor Emerita, Department of History, Portland State University. She holds a doctorate in Classical Art and Archaeology from the University of Michigan. Follow her on Instagram, Pinterest, or Twitter, or buy her book, Vandals to Visigoths.
Karen Carr is Associate Professor Emerita, Department of History, Portland State University. She holds a doctorate in Classical Art and Archaeology from the University of Michigan. Follow her on Instagram or Twitter, or buy her book, Vandals to Visigoths.
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