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Education: Student Outcomes

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Outcome: Explain that evaporation can separate the water from the salt in salt water.
Grade level: K-4
Theme: water cycle

Big Idea
Water can "disappear" or evaporate into the air.

Key Concepts
Evaporation occurs when a liquid is changed into a gas.
Rate of evaporation increases when the temperature of a liquid is increased.
Water moves around our planet in the water cycle.

Evaporation is the process by which water changes from a liquid to a gas or vapor. Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor. Studies have shown that the oceans, seas, lakes, and rivers provide nearly 90 percent of the moisture in the atmosphere via evaporation, with the remaining 10 percent being contributed by plant transpiration.