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| the distance measured by the propagation of a wave between two successive points in the wave that are characterized by the same phase of oscillation |
| the heat absorbed by a unit mass of a solid at its melting point that completely converts the solid to a liquid at the same temperature |
| up quark (ŭp) Pronunciation Key
A quark with a charge of +2/3. Its mass is approximately 10 times the electron mass and is the least mass of all quarks. See Table at subatomic particle. |