fluidity

noun3

1. •
   The state of being fluid rather than viscous
2. •
   The quality of being fluid or free-flowing

   • In addition to all this, the fluidity of the steam itself was much increased by high superheat, usually achieved by means of the Houlet superheater. — 1944
3. •
   A measure of the extent to which something is fluid. The reciprocal of its viscosity.