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Balloon in a Flask

Source Institutions

    Oregon Museum of Science and Industry

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Balloon in a Flask

Learners observe a flask with a balloon attached over the mouth and inverted inside the flask. This display from The Nature of Matter unit in OMSI's Chemistry Lab has great potential as a demonstration or experiment in your classroom. Learners will gain a general understanding of the difference between a liquid and a gas, particularly that air is a gas and that gas molecules exert pressure.

Quick Guide

Preparation Time:
5 to 10 minutes

Learning Time:
30 to 45 minutes

Estimated Materials Cost:
$1 - $5 per group of students

Age Range:
Ages 11 - adult

Resource Types:
Activity, Demonstration, Experiment/Lab Activity


Materials List (per group of students)

  • One large balloon (8- or 9-in. size)
  • One 125-ml Erlenmeyer Flask
  • H2O (water) (10-15 ml)
  • One hot plate
  • Insulated gloves (general storage)


  • Physical Sciences
    • States of Matter
      • Liquids
      • Gases
      • Changes of Phase


To use this activity, learners need to:

  • see

Learning styles supported:

  • Involves hands-on or lab activities


This resource is part of:

Access Rights:

  • Free access



  • All Rights Reserved, Oregon Museum of Science and Industry, ©1997

Funding Source:

  • National Science Foundation


User Lists

This resource is part of these lists:

  • Thumbnail Chem II by dean2fw on 2014-11-28
  • Thumbnail Demos by kdavey on 2015-08-24