What characteristic does viscosity describe regarding spirits?

Viscosity refers to a fluid's resistance to flow, which directly correlates with how thick or thin a liquid appears and behaves. In the context of spirits, viscosity is an important characteristic because it can affect mouthfeel, texture, and how the spirit interacts with other ingredients in cocktails. A spirit with high viscosity may feel syrupy or rich, while one with low viscosity could feel more watery or light. Understanding viscosity helps in appreciating how spirits will mix in drinks and what kind of sensory experience they will deliver when consumed.