Answer:
Viscosity
Step-by-step explanation:
Viscosity is the opposite of fluidity and can be defined as the greater or lesser resistance offered by a liquid to flow freely. In general terms the viscosity of a liquid is independent of its specific density or gravity, but it depends on the temperature at which it is found, being inversely proportional to it.
The force with which a moving fluid layer drags along the adjacent fluid layers determines its viscosity. Hence, high viscosity fluids show resistance to flow, while low viscosity fluids flow more easily. This is what happens with the balls that were dropped in the liquids.