Which of the following statements is true regarding viscosity?

Viscosity is a term that describes a fluid's resistance to flow. It is closely related to the thickness, or stickiness, of a liquid. A liquid with high viscosity, such as honey, flows more slowly compared to a liquid with low viscosity, like water. Therefore, the statement about viscosity relating to the thickness of a liquid is accurate and captures the essence of what viscosity measures.

Understanding viscosity is particularly important in the context of eyelash extension applications, where the adhesive's thickness can affect how well the extensions bond to natural lashes. A proper understanding of viscosity helps practitioners choose the right adhesive for specific conditions and desired results.

Other statements present some misconceptions about viscosity and adhesive properties. For example, viscosity does not specifically decrease as a liquid dries; it can change due to various factors, including temperature and chemical composition. Additionally, newly opened adhesive might not necessarily have a higher viscosity than older bottles, as this depends on the formulation and environmental conditions rather than age alone. Lastly, asserting that all adhesives have the same viscosity overlooks the variety of formulations available, which are designed for different purposes and characteristics.