No Pressure

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In this activity, learners observe what would happen to their bodies if they went to outer space without a space suit. Learners explore the phenomena of differing atmospheric pressure as they make a marshmallow dramatically expand inside of a vacuum sealed glass bottle. This activity comes with a step-by-step guide, investigation questions for the learner, and a section that explains the science behind the experiment.

Quick Guide

Preparation Time:
Under 5 minutes

Learning Time:
10 to 30 minutes

Estimated Materials Cost:
$1 - $5 per student

Age Range:
Ages 6 - 14

Resource Type:


Materials List (per student)

  • A glass bottle
  • Small marshmallows
  • A drink vacuum pump with rubber stopper


  • Earth and Space Science
  • Physical Sciences


Components that are part of this resource:

This resource is part of:

Access Rights:

  • Free access



  • All rights reserved, Science Museum Group, 2020