A key business concern must then be how to attract users prior to reaching critical mass.
en.wikipedia.org Numerous web-based application services appeared during the dot-com bubble of 19972001 and then vanished, having failed to gain a critical mass of customers.
en.wikipedia.org The critical mass of a fissionable material depends upon its nuclear properties (specifically, the nuclear fission cross-section), its density, its shape, its enrichment, its purity, its temperature, and its surroundings.
en.wikipedia.org Generally, people meet at a predetermined station in their city's mass transit system, wait until their numbers have achieved critical mass, and board the train.
en.wikipedia.org It used a dangerously large quantity of fissile material thought to be in excess of considerably more than an uncompressed critical mass.
en.wikipedia.org