Critical mass (sociodynamics)

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Critical mass is a sociodynamic term to describe the existence of sufficient momentum in a social system such that the momentum becomes self-sustaining and fuels further growth.

As a simple example, consider a big city. If a person stops and looks up at the sky, nothing will happen. People nearby will go on about their business. If three people stop and look up at the sky, perhaps some people will momentarily turn around, but then continue on their way. But only a small number of people is required— say, 5 to 7 (depending on such factors as the culture, time of day, width of the street, etc) — to cause others to stop and look up at the sky, too. This number is called the "critical mass" or tipping point.

Social factors influencing critical mass may involve the size, interrelatedness and level of communication in a society or one of its subcultures. Another is social stigma, or the possibility of public advocacy due to such a factor. Critical mass may be closer to majority consensus in political circles, where the most effective position is more often that held by the majority of people in society. In this sense, small changes in public consensus can bring about swift changes in political consensus, due to the majority-dependent effectiveness of certain ideas as tools of political debate.

Critical mass is a concept used in a variety of contexts, including physics, group dynamics, politics, public opinion, and technology.