Strongly interacting Fermi gases are of great current interest. Not only are fermions the most common particles in the universe, but they are also thought to have a universal thermodynamic behaviour for strong interactions(1-3). Recent experiments on ultracold Fermi gases provide an unprecedented opportunity to test universality in the laboratory(4-8). In principle this allows for example - the interior properties of hot, dense neutron stars to be investigated on earth. Here we carry out a detailed test of this prediction. We analyse results from three ultracold fermion experiments involving two completely distinct atomic species in different kinds of atomic-trap environment(6-8). The data are compared with the predictions of a recent strong-interaction theory(9,10). Excellent agreement is obtained, with no adjustable parameters. By extrapolating to zero temperature, we show that the experimental measurements yield a many-body parameter beta similar or equal to -0.59 +/- 0.07, describing the universal energy of strongly interacting Fermi gases.
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