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<math>kT\left(\frac{\partial \rho}{\partial p}\right)=1+\rho \int d r [g(r)-1] </math> (6)
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==Experimental==
It is possible to measure g(r) experimentaly with [[neutron scattering]] or [[x-ray scattering]] diffraction data. In such an experiment, a sample is bombarded with neutrons or x-ray which then diffract to all directions. The average molecular density at each distance can be extracted in according to ??? law: r=wavelength/sin(scattered angle), where r is the distance the neutron traveled before diffracting.
An example of RDF experiment see <ref>''Eigen versus Zundel complexes in HCl-water mixtures.'' Botti, Bruni, Ricci and Soper [[J. Chem. Phys]]; '''2006 125'''; 14508; [http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JCPSA6000125000001014508000001&idtype=cvips&gifs=yes]</ref>
==Formal derivation==
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