In this activity, students are asked to create a change in air pressure using a garbage bag and vacuum cleaner, then create an illustration, model or concept map that explains what is happening. Students can also capture the process in “before and after” videos or photos, then share the videos and/or their models on the KQED website or with @KQEDedspace via Vine, Instagram or Twitter with the hashtag #kqedpressure. Visit KQED's community voices to see experiences and ideas others have posted!