Remember from the previous lesson that there is water vapor in the air. What do you think happens to water vapor in the air if we cool the air down?

Record your observations at 2 minutes.

Record your observations at 5 minutes.

Where in the bottle did you see the strongest evidence of water molecules turning from water vapor back into liquid water? Why do you think this happened there?

What caused the droplets that appeared at those spots to get larger over time?

What did you see 2 water droplets do right after they got really close or just barely touched each other?

What other things have you seen or experienced that behave this way?

How could these ideas help us explain why droplets appeared on the inside of the bottle and grew larger as we cooled the humid air in Investigation A?

How did the behavior of the marbles compare to the behavior of the water droplets when they made contact with each other in Investigation B?

How did the motion of the marbles change as you simulated an increase in temperature?

Was it more like what you picture molecules doing in a liquid or in a solid?

Why are the marbles behaving more like molecules in a gas now? Why would raising the temperature of water high enough cause this to happen?

How did the result of a collision change as you slowed down the speed at which the marbles collided?

How does this help explain why cooling water vapor can cause condensation?