What is one factor that does NOT affect the liquid rise in a capillary tube?

The correct choice identifies fluid viscosity as a factor that does not directly influence the height to which a liquid rises in a capillary tube. The rise of liquid in such tubes is primarily driven by cohesive and adhesive forces as well as surface tension.

Cohesive forces refer to the attraction between molecules of the same substance. These forces contribute to the ability of the liquid to maintain its integrity as it rises. For example, in water, cohesive forces allow for the formation of a continuous column of liquid.

Adhesive forces are the attraction between the liquid molecules and the molecules of the tube material. This interaction helps the liquid climb up the walls of the tube, overcoming gravity, making these forces essential in capillarity.

Surface tension, a manifestation of cohesive forces at the surface of the liquid, plays a critical role in maintaining the shape of the liquid column as it ascends the capillary tube.

While fluid viscosity affects the flow rate and behavior of the fluid under certain conditions, it does not have a direct impact on the height of liquid rise due to capillarity. In fact, higher viscosity can slow the movement but does not prevent the rise caused by cohesive and adhesive forces. Therefore, fluid viscosity is not a determining factor in the capillary