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Strange Soap

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Strange Soap

In this physics activity, learners experiment with soap bubbles to see what variables affect their size. They explore how soap film and bubbles always seek the smallest surface area possible. To take it further, it is suggested that different sized cups are used and the size of the bubbles are compared to see if the ratios are equivalent.

Quick Guide

Preparation Time:
5 to 10 minutes

Learning Time:
10 to 30 minutes

Estimated Materials Cost:
$1 - $5 per student

Age Range:
Ages 8 - 11

Resource Types:
Activity, Experiment/Lab Activity


Materials List (per student)

  • Cups of different sizes
  • Bubble solution (made from liquid dish soap and water)
  • Container for bubble solution (big enough for cup to fit into sideways)
  • Paper towels


  • Mathematics
    • Measurement
      • Size and Scale
      • Circles


To use this activity, learners need to:

  • see
  • touch

Learning styles supported:

  • Involves hands-on or lab activities


Includes alignment to state and/or national standards

This resource is part of:

Access Rights:

  • Free access


Source Collection:

  • COSI classroom and online activities


  • All Rights Reserved, COSI, ©2009


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