[…] Rhodes calculated the uranium bomb would eventually need “about 42 kilograms – 92.6 pounds,” which Rhodes then stated was approximately 2.8 critical masses. In other words, critical mass can be calculated to be about 15 kilograms.

[…] depending on the rare circumstance of there being a critical mass of persons whose combination of interests and resources is high enough to overcome the feasibility problem.

The critical mass comprises the pioneers of an SNS who pay the start-up costs and set up a circle of acquaintances for newcomers; thereafter new subscribers to a mature SNS can join one after another rather than as a group (Heijden, 2004).

Critical mass

Meaning

Noun

Name