soap bubble

a bubble of soapsuds.
something that lacks substance or permanence.

1805–15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
soap bubble
1.  a bubble formed from soapy water
2.  something that is ephemeral but attractive

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Create a fun soap bubble experiment in your kitchen.
When a sampling pump is connected to the bubble generator, the vacuum created
  draws a soap bubble through the device.
Examine piping for leakage using soap bubble solution, or by test gage
Compressed air flow rates were measured immediately before and after each
  experiment using a soap bubble flowmeter.
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