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Active Time
45 minutes to 1 hour
Total Project Time
Up to 1 day
Key Concepts
Ice, melting, freezing point depression

Introduction

Have you ever wondered why ice cubes in your cold drink become gradually smaller, or why their surface becomes smoother as they melt? Does ice always melt this way?

In this activity, you will use water balloons to create giant ice balls and observe how they melt. Can you predict the effect a bit of salt will have on your giant ice ball?

Credits

Sabine De Brabandere, PhD, Science Buddies
This activity is not appropriate for use as a science fair project. Good science fair projects have a stronger focus on controlling variables, taking accurate measurements, and analyzing data. To find a science fair project that is just right for you, browse our library of over 1,200 Science Fair Project Ideas or use the Topic Selection Wizard to get a personalized project recommendation.

Materials

  • Water balloons
  • Water
  • Freezer
  • Oven mitt
  • Small plates
  • Cup
  • Table Salt
  • Water dropper or syringe
  • Food coloring, preferably liquid
  • Workspace that can get wet
  • Towel to wipe your workspace
  • Optional: Flash light
    Materials needed for to observe ice melt with salt as described in this science activity.

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Active Time
45 minutes to 1 hour
Total Project Time
Up to 1 day
Key Concepts
Ice, melting, freezing point depression