Which characteristic describes models that are physical in nature?

Models that are physical in nature are defined by their tangible quality, meaning they can be touched and interacted with directly. These models represent real-world objects or systems in a physical form, such as prototypes, scale models, or pieces of machinery. The tangible aspect allows individuals to engage with the model in a way that helps visualize and understand the underlying concepts, make necessary modifications, and perform tests or demonstrations.

In contrast, abstract models would not have a physical representation; they exist as concepts or ideas. Graphical models, while they may be represented visually, do not necessarily possess physicality. Theoretical models are based on principles and assumptions that may not have a direct physical form. Hence, the characteristic of being tangible distinctly identifies physical models.