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critical temperature
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critical mass

crit·i·cal mass


noun 
Definition:
 
1. point of change: a point or situation at which change occurs
Support for the measure has reached critical mass.

2. necessary size or amount: the size or amount of something that is required before an activity or event can take place

3. amount of fissionable material: the smallest amount of fissionable material needed to maintain a nuclear chain reaction

4. business necessary number of customers: the number of customers or size of market share that allows a business enterprise to become profitable

5. comput point of excessive software features: the point in software development at which a piece of software acquires so many features that it ceases to be useful

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