关于热力学、热量传递和质量传递,以及流体工程的 A-Z 指南
中文 English Русский Português Español Français Deutsch 关于我们 编辑 联系我们 访问 Begell House
View in Semantic Map View in A-Z Index

Avogadro’s hypothesis, first stated in 1811, was that equal volumes of gases under fixed conditions of temperature and pressure contain equal numbers of molecules. Half a century passed before the significance of this statement was fully appreciated, and Avogadro did not live to see his hypothesis confirmed. Today his name is given to the number of molecules in a gram-mole (or atoms in a gram-atom), or more precisely by SI standards the number of entities in one mole of carbon 12. This is known as Avogadro number or Avogadro constant, NA.

In the past NA has been measured experimentally by various methods, each producing different values of about 6 × 1023 per mol [Moelwyn-Hughes (1957)]. Today the accepted value is

Note that N A can also be derived from the relationship

REFERENCES

Moelwyn-Hughes, E. A. (1957) Physical Chemistry, Pergamon Press.

References

  1. Moelwyn-Hughes, E. A. (1957) Physical Chemistry, Pergamon Press.
浏览次数: 24551 创建日期: 2 February 2011 最后修改日期: 3 February 2011 © Copyright 2010-2021 返回顶部
A-Z 索引 作者/编辑 语义地图 视觉画廊 贡献 Guest