0 the smallest amount of matter that is needed to produce a nuclear chain reaction --
1 the size or number that something needs to reach before a particular change or development can happen: --
The critical mass has not yet been reached, but we seem to be moving towards it.
It is intended to increase the critical mass of cultural and entertainment facilities necessary to sustain the life of the city.
To create a different world is a somewhat larger matter of reflexive behaviour on the part of a critical mass of key actors.
Did that have anything to do with achieving "critical mass" in the amount of human capital?
Yet overemphasis on leaders amounts to neglect of the critical mass necessary for a movement, often regarding them as simply objects of elite manipulation.
The extent of the critical mass that is necessary for analogy to start operating is debatable.
This subset of fishermen can be considered as the critical mass needed to initiate a collective action.
There is a critical mass for blow-up and a rich set of dynamics including families of similarity solutions for finite-time blow-up and infinite-time spreading.