Final answer:
The mass of swirling fluids or gases in question is correctly termed a 'vortex,' which is associated with turbulent flow patterns in fluid dynamics, and is exemplified by phenomena such as tornadoes.
Step-by-step explanation:
A vortex is a mass of swirling fluids or gases. In the context of physics, a vortex is associated with the behavior of fluids and gases in which there is a circular or spiral motion that can create eddies and swirls. These turbulent patterns can often be seen when there is an obstruction in the flow or at high speeds, such as with a tornado, which exhibits vortex characteristics in the atmosphere. When comparing the provided options, viscosity (n) is the measure of the internal friction in a fluid and has units of (N/m²)s or Pa · s. Drag refers to the force opposing the motion of an object through a fluid or across its surface. A tornado, while being an example of a vortex, is specifically a violent, dangerous, funnel-shaped cloud that descends from a thunderstorm to the ground. Consequently, the correct answer to the question is B - Vortex.