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单词 proton
释义
proton
Physics

  • A particle that is stable, bears a positive charge equal in magnitude to that of the electron, and has a mass of 1.672 614×10−27 kg, which is 1836.12 times that of the electron. The proton occurs in all atomic nuclei (the hydrogen nucleus consists of a single proton). The proton is not now considered to be an elementary particle, because it is now known to consist of three quarks held together by gluons.

Astronomy

  • A subatomic particle that has a positive charge, equal and opposite to that of the electron. It is a hadron, with a rest mass of 1.673 × 10–27 kg, which is 1836.15 times that of the electron. It is present in the nuclei of all atoms; the hydrogen nucleus is a single proton. A proton is not now considered to be an elementary particle, because it is now known to consist of three quarks held together by gluons.

Chemistry

  • A particle that is stable, bears a positive charge equal in magnitude to that of the electron, and has a mass of 1.672 614 × 10−27 kg, which is 1836.12 times that of the electron. The proton is a hydrogen ion and occurs in all atomic nuclei. A proton is not now considered to be an elementary particle, because it is now known to consist of three quarks held together by gluons. See also hydron.

Electronics and Electrical Engineering

  • An elementary particle having a positive charge equal to that of the electron, mass 1.6726 × 10−27 kg, which is about 1836 times the electron mass, and spin ½. It also has an intrinsic magnetic moment. The proton forms the nucleus of the hydrogen atom and is a constituent part of all atomic nuclei. The number of protons in an atomic nucleus is equal to the number of orbital electrons and is the atomic number of the atom.
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