The 47 neutral PFAS are broadly distributed in the plot, reflecting the diversity of the properties. A general trend is that neutral PFAS prefer the air phase; the equilibrium mass in air is >99% for 16 and at least 1% for 41 of the 47 compounds. In addition, water is often an unpreferred phase; the equilibrium mass in water is >1% for only 10 PFAS. These features are well expected due to the weak van der Waals interactions with any phase and the high cavity energy in water of PFAS.