What are the physical properties of pretzels?

Pretzels are typically characterized by their hard, crunchy exterior and soft, chewy interior, depending on the type. They have a golden-brown color due to the Maillard reaction during baking, and their distinctive knot shape contributes to their unique texture. The surface is often sprinkled with coarse salt, enhancing flavor and providing a contrasting texture. Overall, pretzels are dense yet lightweight, making them a popular snack choice.