soap bubble

noun
1.
a bubble of soapsuds.
2.
something that lacks substance or permanence.

Origin:
1805–15

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
soap bubble
 
n
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
  monitoring.
Compressed air flow rates were measured immediately before and after each
  experiment using a soap bubble flowmeter.
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