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单词 molecule
释义
molecule

Physics
  • One of the fundamental units forming a chemical compound; the smallest part of a chemical compound that can take part in a chemical reaction. In most covalent compounds, molecules consist of groups of atoms held together by covalent or coordinate bonds. Covalent substances that form macromolecular crystals have no discrete molecules (in a sense, the whole crystal is a molecule). Similarly, ionic compounds do not have single molecules, being collections of oppositely charged ions.


Astronomy
  • The smallest part of a compound, which is a substance formed by the chemical combination of one or more types of atom. For example, water consists of two atoms of hydrogen and one atom of oxygen, hence it has the formula H2O.


Chemistry
  • One of the fundamental units forming a chemical compound; the smallest part of a chemical compound that can take part in a chemical reaction. In most covalent compounds, molecules consist of groups of atoms held together by covalent or coordinate bonds. Covalent substances that form macromolecular crystals have no discrete molecules (in a sense, the whole crystal is a molecule). Similarly, ionic compounds do not have single molecules, being collections of oppositely charged ions.


Chemical Engineering
  • The smallest part of an element or chemical compound that can exist separately and retain its properties. A molecule of helium consists of a single atom, whereas a molecule of water consists of an aggregation of oxygen and hydrogen held together by valence forces.


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