  In this paper, we used a theoretical measure known as distance between the
states, $\mathcal{E}(\rho_e)$, to determine the bipartite entanglement of a one
dimensional magnetic dimer system. The calculation was compared with the
well-known entanglement measure, concurrence, and found to be the same.
$\mathcal{E}(\rho_e)$ was, then, expressed in terms of two thermodynamic
quantities, namely, magnetic susceptibility and specific heat. Experimental
verification of temperature variation of the bipartite entanglement measure in
terms of magnetic susceptibility and specific heat was done on single crystals
of copper acetate-an excellent one dimensional dimer system. The results showed
the existence of bipartite entanglement till temperatures as high as room
temperature! Large sized single crystals of copper acetate were grown by a new
evaporation technique and characterised by TGA, IR and Raman spectroscopy
measurements.Density functional theory calculations were done to calculate the
delocalisation index which showed much lower values of $\delta(Cu,Cu)$ than
other bonds, implying that the probability of direct Cu-Cu exchange in copper
acetate is very small.
