Critical mass
WordNet

noun


(1)   The minimum mass of fissionable material that can sustain a chain reaction
(2)   The minimum amount (of something) required to start or maintain a venture
"The battle for the computer market has now reached critical mass"
"There is now a critical mass of successful women to take the lead"
"They sold the business because it lacked critical mass"
WiktionaryText

Noun



  1. the amount of fissile material that is needed to support a self-sustaining nuclear chain reaction
  2. A quantity or amount required to trigger a phenomenon.
 
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