During levigation, what is the purpose of adding oil to a powder?

The purpose of adding oil to a powder during levigation is to create a paste. Levigation is a process used in pharmacy to reduce the particle size of a powder and to make it smoother by incorporating a liquid, often a specific type of oil. This action facilitates the formation of a uniform and cohesive mixture, which can then be used in compounded medications or formulations.

Creating a paste allows for better manipulation of the powder, ensuring that it adheres well to other components of a formulation, which can be crucial in achieving the desired consistency and stability of the final product. This is particularly important in pharmaceuticals where a smooth texture can enhance the application or delivery of the drug.

In contrast to the other options, dissolving the powder or enhancing flavor would not be the primary goal of the levigation process with oil, as it's more about achieving a specific physical texture. Similarly, thickening might happen as a side effect of creating a paste, but the primary intent is the development of a smooth, workable consistency.