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Evaporation of Salt Water
In this activity, you will model the evaporation of salt water. Evaporation of water from the oceans is an important part of Earth’s water cycle.
You will need these materials:
1 sheet of colored construction paper
clear plastic or glass container, just large enough to hold the construction paper
a large drinking glass
3 teaspoons of salt
a teaspoon
one-fourth cup water at room temperature
Hypothesis and Data Collection
Fill the drinking glass with one-fourth cup of water and mix in 3 teaspoons of salt. Mix thoroughly until the salt is dissolved. (You may add a few more teaspoons of water to dissolve it, if needed.) Place the construction paper in the container and gently pour the water on the paper until it is saturated. In part A, predict what will happen in the container overnight.
Part A
What do you think will happen when you leave the paper in the container overnight?
Part B
Now leave the paper in the container overnight. In the morning, look at the paper and write down your observations.
Analyze and Extend
Part A
Were your predictions correct? Explain.
Part B
What process caused the changes that occurred on the paper?
Part C
Evaporation happens in the ocean as part of the water cycle. What fuels evaporation in the ocean?
Part D
Some ocean water evaporates, but certainly not all of it. When evaporation occurs, what happens to the ocean water that doesn’t evaporate? Explain in terms of the salt content and what you saw in the experiment.
Dispose of your waste properly:

Shake the salt off the paper into the trash.
Recycle the paper.