Kopp's law can refer to either of two relationships discovered by the German chemistHermann 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 theDulong–Petit law 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]

TheKopp–Neumann law, named for Kopp andFranz Ernst Neumann, is a common approach for determining thespecific heatC (in J·kg⁻¹·K⁻¹) of compounds using the following equation:^[3]$${\displaystyle C=\sum _{i=1}^N{C}_i{f}_i,}$$ whereN is the total number of compound constituents, andC_i andf_i denote thespecific heat andmass fraction of thei-th constituent. This law works surprisingly well at room-temperature conditions, but poorly at elevated temperatures.^[3]

• Rule of mixtures

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

• Thorpe, T. E. (1901)."The Life Work of Hermann Kopp".Memorial Lectures Delivered Before the Chemical Society.25:774–815.

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