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1. Oxford Dictionary

   critical mass

   • IPA[ˌkrɪtɪkl ˈmas]

   英式

   • n.
     the minimum amount of fissile material needed to maintain a nuclear chain reaction.；the minimum size or amount of resources required to start or maintain a venture

   • noun: critical mass, plural noun: critical masses

2. • 釋義

   n.

   名詞

   • 1. the minimum amount of fissile material needed to maintain a nuclear chain reaction.
   • 2. the minimum size or amount of resources required to start or maintain a venture some of our new industries are now reaching critical mass