Dispersions may become stable through two different phenomena&colon; charge repulsion and steric or entropic repulsion. The thermodynamic driving free energy can be either enthalpic or entropic or both. That biomass (W) is subjected to deterioration over time from thermodynamic, entropic pressure. These effects are for anisotropic particles referred to as directional entropic forces. This entropic effect is called the hydrophobic effect. Another example of an entropic force is the hydrophobic force. MST has been used to estimate the enthalpic and entropic contributions to biomolecular interactions. Holding the pressure, the addition of solute decreases the chemical potential (an entropic effect). In 2009, Erik Verlinde proposed a conceptual model that describes gravity as an entropic force. Heat dispersion is one of the examples of the entropic interaction. The entropic force can be considered as an emergent of the entropic interaction. What is the microscopic origin of such an entropic force or pressure? In 2009, Erik Verlinde argued that gravity can be explained as an entropic force. A binary (or higher arity) operation that commutes with itself is called medial or entropic. In many systems, directional entropic forces drive this behavior.