Viscosity
Each fluid has a certain amount of viscosity, even water. It defines the tendency of particles to stick together.
With very high values you can observe the typical strings in viscous fluids when they are torn apart. Substances with very high viscosity are honey, tar or syrup, for example.
Fluids with low viscosity are alcohol, many solvents or liquid gases. Exaggerated settings can lead to misbehaving particles with high velocities.
Surface tension