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Item WC070002: When air moves across a lake, its humidity may not increase because it may already be as humid as it can get.

When air moves over a lake, what will happen to the humidity of the air?

  1. If the air moving across the lake is warm, its humidity will increase no matter how humid it already is.
  2. The humidity of the air moving across the lake will increase no matter how warm it is or how humid it already is.
  3. The humidity of the air moving across the lake will stay the same no matter how warm it is or how humid it already is.
  4. You need more information to predict what will happen to the humidity of the air moving across the lake because it already may be as humid as it can get.
Distribution of Responses
Chart showing distrubtion of responses for Item 070002
Students Responding Correctly
Group Correct Total Percent
Overall 611 2648 23%
Grades
  6–8 407 1657 25%
  9–12 204 989 21%
Gender
  Male303122025%
  Female293137521%
Primary Language
  English539233823%
  Other5824723%

View data table

Disciplinary Core Ideas
ESS2.C Water continually cycles among land, ocean, and atmosphere via transpiration, evaporation, condensation and crystallization, and precipitation, as well as downhill flows on land.
Notes
NGSS does not explicitly address the idea that there is a maximum amount of water vapor that air can hold at a given temperature.