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| pertaining to a mass of radioactive material in which the rate of a chain reaction increases with time |
| the transfer of heat between two parts of a stationary system, caused by a temperature difference between the parts |
| strange quark
A quark with an electric charge of -1/3 and a mass of 391 electron masses, greater than that of the up quark and down quark, but smaller than that of other quarks. The presence of a strange quark contributes strangeness of -1 to the physical system containing it, while a strange antiquark contributes strangeness of +1. See Table at subatomic particle. |