What is a characteristic property of polystyrene?

Polystyrene is known for being lightweight and hard, which makes it a popular choice in various applications, including packaging and disposable products. Its lightweight nature allows for easier handling and transportation, while its hardness provides durability and resistance to deformation under normal use.

While it does possess some degree of brittleness, this is not its defining characteristic compared to its lightweight and hard properties. Polystyrene is not highly elastic, as its structure does not allow for significant stretching or bending without breaking. Additionally, it is not extremely heavy; in fact, its lightweight nature is one of the reasons it is preferred for many products. Choosing the characteristic of being lightweight and hard accurately reflects the significant physical properties that polystyrene exhibits.