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as in:  up and down quarks

Up and down quarks clump together to form protons and neutrons.
  physics:  one of the three types of elementary particles according to the Standard Model; combinations make up heavier particles such as mesons, baryons, protons, and neutrons
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quark quarks
The other two types of elementary particles according to the Standard Model are leptons and gauge bosons.

There are thought to be six flavors of quarks (and their antiquarks):  up, down, charm, strange, top, and bottom. Each quark has an electric charge of +2/3 or -1/3.

See the Wikipedia link for an interesting elaboration.
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  • Up and down quarks clump together to form protons and neutrons.
  • Quarks, dwarf stars, black holes, and the like.
    Kate DiCamillo  --  Flora & Ulysses
  • A Metaverse vehicle can be as fast and nimble as a quark.
    Neal Stephenson  --  Snow Crash
  • Up-quarks have down-quarks.
    Dan Brown  --  Angels & Demons

  • Show more
  • A large part of the increase was due to PDF files and Quark documents.
    Stieg Larsson  --  The Girl Who Played with Fire
  • Up-quarks have down-quarks.
    Dan Brown  --  Angels & Demons
  • Quarks and mesons?
    Dan Brown  --  Angels & Demons
  • Did they really believe quarks and mesons inspired the average human being?
    Dan Brown  --  Angels & Demons
  • Use the Lord’s name in vain all you like," he laughed, "just don’t slander any quarks or mesons."
    Dan Brown  --  Angels & Demons
  • Words for Flora
    would be
    easier without
    because you
    all of it—
    sprinkles, quarks, giant
    donuts, eggs sunny—side up—
    are the ever—expanding
    to me.
    Kate DiCamillo  --  Flora & Ulysses

  • Show more again
  • The list continued on with these words: RITA!
    Sunny—side up
    Giant squid
    little shepherdess
    Universe (expanding)
    The list ended with the words of Dr. Meescham’s good-bye: I promise to always turn back toward you.
    Kate DiCamillo  --  Flora & Ulysses
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Associated words [difficulty]:   quark [9]
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Most commonly used in these subjects:   Science, Engineering, Logic & Reasoning
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