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Microwave soap

You will need:

  • A microwave-safe bowl
  • Household soap (wet soap works best, so use an old bar of soap from the shower)
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Instructions

  1. Place the bar of soap in a microwave-safe dish and zap it on high for between 30-60 seconds.
     
  2. You may need longer for low power microwaves.
     
  3. Watch as a foamy mass grows from the soap! (careful; do not touch until the soap is cool).

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microwave soap1

Why Does This Happen?

The water inside the soap is undergoing a phase change from liquid to water vapour, and expanding. The foamy effect also comes about from the expansion air bubbles trapped inside the soap. Basically by heating the soap and expanding water and air inside you end up with this lovely warm soapy foam. I used a small bar of soap and zapped it for about a minute. 

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