In this lab, students introduce water vapor and smoke into a bottle, pressurize it, and quickly release the pressure. The rapid depressurization decreases the temperature of the water vapor, which encourages it to condense around the smoke particles, resulting in cloud formation.

Additional Equipment: Matches, empty 20oz (half-liter) soda bottle

Required Equipment

Acknowledgements: Thank you to Cary Busby for her work in developing this lab. Cary is a High School Physics teacher and has presented physics -related workshops at NSTA conferences and statewide science conferences around the country.