Kopp's law can refer to either of two relationships discovered by the German chemist

Hermann Franz Moritz Kopp Hermann Franz Moritz Kopp (30 October 1817 – 20 February 1892), German chemist, was born at Hanau, where his father, Johann Heinrich Kopp (1777–1858), a physician, was professor of chemistry, physics and natural history at the local lyce ...

(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 The Dulong–Petit law, a thermodynamic law proposed by French physicists Pierre Louis Dulong and Alexis Thérèse Petit, states that the classical expression for the molar specific heat capacity of certain chemical elements is constant for tempe ...

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 Franz Ernst Neumann (11 September 1798 – 23 May 1895) was a German mineralogist, physicist and mathematician. Biography Neumann was born in Joachimsthal, Margraviate of Brandenburg, near Berlin. In 1815 he interrupted his studies at Berlin to ...

, is a common approach for determining the

specific heat In thermodynamics, the specific heat capacity (symbol ) of a substance is the heat capacity of a sample of the substance divided by the mass of the sample, also sometimes referred to as massic heat capacity. Informally, it is the amount of heat t ...

''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

and mass fraction of the ''i''-th constituent. This law works surprisingly well at room-temperature conditions, but poorly at elevated temperatures.

References

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

ASIN Asin Thottumkal (born 26 October 1985), known mononymously as Asin, is a former Indian actress who appeared predominantly in Tamil, Hindi and Telugu films. She is a trained Bharatanatyam dancer. She has received three Filmfare Awards. She beg ...

: B000OLCK08

Kopp–Neumann law

See also

References

Further reading