“formula”的概念、定义、翻译、参考文献-科学参考

formula

Physics

1. (in chemistry) A way of representing a chemical compound using symbols for the atoms present. Subscripts are used for the numbers of atoms. The molecular formula simply gives the types and numbers of atoms present. For example, the molecular formula of ethanoic acid is C₂H₄O₂. The empirical formula gives the atoms in their simplest ratio; for ethanoic acid it is CH₂O. The structural formula gives an indication of the way the atoms are arranged.

2. (in mathematics and physics) A rule or law expressed in algebraic symbols.

Chemistry

A way of representing a chemical compound using symbols for the atoms present. Subscripts are used for the numbers of atoms. The molecular formula simply gives the types and numbers of atoms present. For example, the molecular formula of ethanoic acid is C₂H₄O₂. The empirical formula gives the atoms in their simplest ratio; for ethanoic acid it is CH₂O. The structural formula gives an indication of the way the atoms are arranged. Commonly, this is done by dividing the formula into groups; ethanoic acid can be written CH₃.CO.OH (or more usually simply CH₃COOH). Structural formulae can also show the arrangement of atoms or groups in space.

Chemical Engineering

1. A statement in algebraic form representing a mathematical relationship of variables. An empirical formula is based on experimental results and not necessarily on the laws of physics.

2. The use of symbols to present a chemical compound in which the symbols represent elements. Subscripts are used to represent the number of atoms. For example, the molecular formula for ethanol is C₂H₅OH, which is a molecular compound that has two carbon atoms, six hydrogen atoms, and one oxygen atom. See chemical formula.

单词	formula
释义	formula Physics 1. (in chemistry) A way of representing a chemical compound using symbols for the atoms present. Subscripts are used for the numbers of atoms. The molecular formula simply gives the types and numbers of atoms present. For example, the molecular formula of ethanoic acid is C₂H₄O₂. The empirical formula gives the atoms in their simplest ratio; for ethanoic acid it is CH₂O. The structural formula gives an indication of the way the atoms are arranged. 2. (in mathematics and physics) A rule or law expressed in algebraic symbols. Chemistry A way of representing a chemical compound using symbols for the atoms present. Subscripts are used for the numbers of atoms. The molecular formula simply gives the types and numbers of atoms present. For example, the molecular formula of ethanoic acid is C₂H₄O₂. The empirical formula gives the atoms in their simplest ratio; for ethanoic acid it is CH₂O. The structural formula gives an indication of the way the atoms are arranged. Commonly, this is done by dividing the formula into groups; ethanoic acid can be written CH₃.CO.OH (or more usually simply CH₃COOH). Structural formulae can also show the arrangement of atoms or groups in space. Chemical Engineering 1. A statement in algebraic form representing a mathematical relationship of variables. An empirical formula is based on experimental results and not necessarily on the laws of physics. 2. The use of symbols to present a chemical compound in which the symbols represent elements. Subscripts are used to represent the number of atoms. For example, the molecular formula for ethanol is C₂H₅OH, which is a molecular compound that has two carbon atoms, six hydrogen atoms, and one oxygen atom. See chemical formula.
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