Methods for predicting liquid properties can be organized by their "scale" of description, that is, the length scales and time scales over which they apply.
*Macroscopic methods use equations that directly model the large-scale behavior of liquids, such as their thermodynamic properties and flow behavior. 
*Microscopic methods use equations that model the dynamics of individual molecules.
*Mesoscopic methods fall in between, combining elements of both continuum and particle-based models.