GLYPH<Minus> 2 GLYPH<Minus> 1 0 1 2 2 4 6 8 b for attractive fermions PSfrag replacements b T/µ FIG. 6: The scaling function b for attractive fermions as a function of T/µ . The above expression is easily evaluated numerically using the expressions of the last section. The result is displayed for small values of µ/T in Figure 9. In this regime, η/s is well above the conjectured bound, and comparable to the 3 d values extracted from the experimental data[31]. We find This is well-below the values for common substances like water, however it is compa- rable to values for liquid helium, which is about 9 times the bound[24]. In the region shown: In Figure 10 we plot η/s as a function of T/T$_{F}$ , and one observes a behavior quite similar both qualitatively and quantitatively to the 3d data summarized in[31], where the minimal value is about 6 times the bound. lim µ/T → 0 η s = 7 . 311 ℏ 4 πk$_{B}$ (75) η s ≥ 6 . 07 ℏ 4 πk$_{B}$ (76) 26