Final answer:
A good cork is characterized by its impermeability, flexibility, uniform structure, and absence of mold, which ensure its effectiveness in sealing and maintaining the quality of bottled products.
Step-by-step explanation:
The characteristics of a good cork can be described by its functionality and desirable properties, such as its impermeability, flexibility, uniform structure, and absence of mold. These characteristics make it suitable for various applications including sealing wine bottles where it needs to prevent liquid from escaping while adapting to the bottle's neck. Cork's impermeability ensures that air and liquid do not pass through easily, maintaining the wine's quality. Flexibility allows the cork to be inserted into the bottle without breaking. A uniform structure is important for consistent performance, whereas the absence of mold is critical for the cleanliness and health standards required in food and beverage applications.