Kopp's law can refer to either of two relationships discovered by the German chemist Hermann Franz Moritz Kopp (1817–1892).
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:[3]
where N is the total number of compound constituents, and Ci and fi 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.
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