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| radiation in the form of elementary particles emitted by an atomic nucleus produced by decay of radioactive substances or by nuclear fission |
| the ability of a substance to flow; a measure of this ability, the reciprocal of the coefficient of viscosity |
| critical pressure | |
| —n | |
| the pressure of a gas or the saturated vapour pressure of a substance in its critical state | |
| critical pressure
The pressure of a substance at its critical point. |