Kopp's Law

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

#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 Dulong–Petit law retain these lower values in their compounds."
#In studying organic compounds, Kopp found a regular relationship between boiling points and the number of CH₂ groups present.See page 942 of

Kopp–Neumann law

The Kopp–Neumann law, named for Kopp and Franz Ernst Neumann, is a common approach for determining the specific heat ''C'' (in J·kg⁻¹·K⁻¹) of compounds using the following equation:
$C = \sum_^N C_i f_i,$
where ''N'' is the total number of compound constituents, and ''C_i'' and ''f_i'' denote the specific heat and mass fraction of the ''i''-th constituent. This law works surprisingly well at room-temperature conditions, but poorly at elevated temperatures.

See also

* Rule of mixtures

References

* Frederick Seitz, The Modern Theory of Solids, McGraw-Hill, New York, USA, 1940, ASIN: B000OLCK08

Further reading

*

Laws of thermodynamics

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