“abundance”的概念、定义、翻译、参考文献-科学参考

abundance

Physics

1. The ratio of the total mass of a specified element in the earth’s crust to the total mass of the earth’s crust, often expressed as a percentage. For example, the abundance of aluminium in the earth’s crust is about 8%.

2. The ratio of the number of atoms of a particular isotope of an element to the total number of atoms of all the isotopes present, often expressed as a percentage. For example, the abundance of uranium–235 in natural uranium is 0.71%. This is the natural abundance, i.e. the abundance as found in nature before any enrichment has taken place.

Astronomy

See Elements, Abundance of.

Chemistry

1. The ratio of the total mass of a specified element in the earth’s crust to the total mass of the earth’s crust, often expressed as a percentage. For example, the abundance of aluminium in the earth’s crust is about 8%.
2. The ratio of the number of atoms of a particular isotope of an element to the total number of atoms of all the isotopes present, often expressed as a percentage. For example, the abundance of uranium-235 in natural uranium is 0.71%. This is the natural abundance, i.e. the abundance as found in nature before any enrichment has taken place.

Geography

The total number of individuals of a certain species present in an area, generally estimated by sampling methods (such as capture–recapture), and which may vary according to competition, predation, and resources.
An index of abundance is a relative measure of the size of a population or sub-unit of the population, such as a year class. The abundance, for example, of fish may be measured as number/weight of fish caught per standard unit of fishing effort, in a given area, and for a given time span, and then compared to earlier data. See Goel et al. (2012) CIMSiM, for models of species abundance in biogeography.

单词	abundance
释义	abundance Physics 1. The ratio of the total mass of a specified element in the earth’s crust to the total mass of the earth’s crust, often expressed as a percentage. For example, the abundance of aluminium in the earth’s crust is about 8%. 2. The ratio of the number of atoms of a particular isotope of an element to the total number of atoms of all the isotopes present, often expressed as a percentage. For example, the abundance of uranium–235 in natural uranium is 0.71%. This is the natural abundance, i.e. the abundance as found in nature before any enrichment has taken place. Astronomy See Elements, Abundance of. Chemistry 1. The ratio of the total mass of a specified element in the earth’s crust to the total mass of the earth’s crust, often expressed as a percentage. For example, the abundance of aluminium in the earth’s crust is about 8%. 2. The ratio of the number of atoms of a particular isotope of an element to the total number of atoms of all the isotopes present, often expressed as a percentage. For example, the abundance of uranium-235 in natural uranium is 0.71%. This is the natural abundance, i.e. the abundance as found in nature before any enrichment has taken place. Geography The total number of individuals of a certain species present in an area, generally estimated by sampling methods (such as capture–recapture), and which may vary according to competition, predation, and resources. An index of abundance is a relative measure of the size of a population or sub-unit of the population, such as a year class. The abundance, for example, of fish may be measured as number/weight of fish caught per standard unit of fishing effort, in a given area, and for a given time span, and then compared to earlier data. See Goel et al. (2012) CIMSiM, for models of species abundance in biogeography.
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