critical mass(redirected from Subcriticality)
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1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
2. The total mass of matter needed to generate sufficient gravitational force to halt the current expansion of the universe.
3. An amount or level needed for a specific result or new action to occur: "[Plastic bags are] so nearly weightless that it's difficult to gather enough of a critical mass to make recycling them economically worthwhile" (Susan Freinkel).
1. (Nuclear Physics) the minimum mass of fissionable material that can sustain a nuclear chain reaction
2. the minimum amount of money or number of people required to start or sustain an operation, business, process, etc: the critical mass for a subscription digital sports channel.
1. the amount of a given fissionable material necessary to sustain a chain reaction.
2. an amount necessary or sufficient to have a significant effect or to achieve a result.
The minimum amount of fissionable material capable of supporting a chain reaction under precisely specified conditions.
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|Noun||1.||critical mass - the minimum amount (of something) required to start or maintain a venture; "the battle for the computer market has now reached critical mass"; "there is now a critical mass of successful women to take the lead"; "they sold the business because it lacked critical mass"|
amount - the relative magnitude of something with reference to a criterion; "an adequate amount of food for four people"
|2.||critical mass - the minimum mass of fissionable material that can sustain a chain reaction|
mass - the property of a body that causes it to have weight in a gravitational field