Kopp's law

Kopp's law can refer to either of two relationships discovered by the German chemist Hermann Franz Moritz Kopp (1817–1892).

1. Kopp found "that the molecular heat capacity of a solid compound is the sum of the atomic heat capacities of the elements composing it; the elements having atomic heat capacities lower than those required by the law of Dulong and Petit retain these lower values in their compounds."^[1]
2. In studying organic compounds, Kopp found a regular relationship between boiling points and the number of CH₂ groups present.^[2]

References

1. ^ See page 96 of Millard, Earl Bowman (1921). Physical Chemistry for Colleges. New York: McGraw-Hill. http://books.google.com/?id=oYE6AAAAMAAJ&pg=PA96&dq=Kopp%27s+Law. 
2. ^ See page 942 of Miller, William Allen (1869). Elements of Chemistry. London: Longmans, Green, Reader, and Dyer. http://books.google.com/?id=b7ktAAAAYAAJ&pg=PA942&dq=Kopp%27s+law. 

Further reading

• Thorpe, T. E. (1901). "The Life Work of Hermann Kopp". Memorial lectures delivered before the Chemical Society 25: 774–815. http://books.google.com/?id=dcfQAAAAMAAJ&pg=PA775&dq=Herman+Kopp+memorial.