Assertion: uranium's mass | /r/HasProperty | a critical
Facets:
Source sentences:
text: If the reaction will sustain itself, it is said to be critical, and the mass of 235U required to produce the critical condition is said to be a critical mass.
text: So.. if you have exactly enough U-235 atoms arrange in precise space around a central neutron, that neutron will be absorbed by 1 atom of U-235, which will release 3. and if 2 of those neutrons escape and 1 is absorbed by another U-235 atom which fizzes and releases 3.. and 1 is absorbed and this continues you have a "chain reaction" and a "critical mass" (actually a critical mass-density) of U-235.