1) Certain subatomic particle
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https://www.crosswordclues.com/clue/up-quark
The up quark or u quark (symbol: u) is the lightest of all quarks, a type of elementary particle, and a major constituent of matter. It, along with the down quark, forms the neutrons (one up quark, two down quarks) and protons (two up quarks, one down quark) of atomic nuclei. It is part of the first generation of matter, has an electric charge of ...
Found on
http://en.wikipedia.org/wiki/Up_quark
(from the article `quark`) ...(), `down` (), and `strange` (). Each carries a fractional value of the electron charge (i.e., a charge less than that of the electron, ). The up ... ...charges for the observed particles, usually 0, +, or . Only two types of quark are necessary to build protons and neutrons, the constit...
Found on
http://www.britannica.com/eb/a-z/u/14
[
n] - a stable quark with an electric charge of +2/3 and a mass 607 times that of an electron
Found on
http://www.webdictionary.co.uk/definition.php?query=up%20quark
noun a stable quark with an electric charge of +2/3 and a mass 607 times that of an electron
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https://www.encyclo.co.uk/local/20974
The first flavor of quark (in order of increasing mass), with electric charge +2/3.
Found on
https://www.encyclo.co.uk/local/21257
the quark having electric charge 2/3 times the elementary charge and strangeness and charm equal to 0. Also called
Found on
https://www.infoplease.com/dictionary/up-quark
No exact match found.
