Look for: ideas of analysis and conclusion questions fo…

5.A Collect and analyze different forms of data to identify patterns across our data sources that serve as evidence that condensation that forms on the outside surface of a cold cup system comes from the air outside the system.

• ideas of analysis and conclusion questions for both parts of the Water Droplet Investigation.
• patterns from the evidence that point to condensation coming from the air outside the cup.

For Part A, listen for students to claim that the mass increase is due to water from the outside air condensing on the cup surface. If students are missing this connection, probe what they would expect to happen to the measured mass if the water droplets came from inside the cup (e.g., the mass would stay the same or go down).

For Part B, listen for students to use evidence that since the water droplets are clear and the water inside the cup is colored, the water on the outside cannot come from inside the cup.

If students continue to struggle with one or the other of these investigations, point them to their observations during related experiences in which water droplets formed on a surface where there was no water to begin with (e.g., dew forming on grass in the morning, condensation on windows where it was cold inside and warm outside).