National Lampoon’s Christmas Vacation (1989)

Concept featured in clip: Air density changes with temperature
Location of clip: (DVD)

Play Flickclip Here

Summary of clip: Clark is accidentally locked in the attic. As he’s searching for warmer clothes, he steps on a weak spot and falls through the attic floor. He holds his hands over the hole he has just made to feel the warm air.

Connection of flickclip to the concept: Warm air rises, which is why Clark holds his hands over the hole in the attic floor.
Suggestions to teachers:

Questions to ask after viewing:
Why does Clark hold his hands over the hole in the attic floor?
Why does warm air rise?
How do you know?
Why does cold air sink?
What does this make you wonder about our world?
This concept is so important in our everyday lives. Most people know that warm air rises, but do not understand why. This video can be used to engage students in a lesson about air density, movement of molecules, and even greenhouse gas pollution!