content_image/365221.jpg content_image/365226.jpg content_image/365227.jpg content_image/365228.jpg
<img src='content_image/365221.jpg'>

Since the pressure is determined by the average kinetic energy, and the ideal gas relation eq. (30) still holds for a unitary gas, the average kinetic energy per particle is just ϵ$_{1}$ = −F /n , eq. (31). Finally we obtain: 

<img src='content_image/365226.jpg'>

where all the quantities in the above formula are the single component values of the last section. In terms of the scaling functions: 

<img src='content_image/365227.jpg'>

For two-component fermions the available phase space I is doubled. The cross- section is halved since spin up particles only scatter with spin down. Finally the entropy is doubled. This gives 

<img src='content_image/365228.jpg'>

