Which statement about glass blocks in a wall is true?

Glass blocks are typically used in non-load-bearing walls, primarily for decorative and aesthetic purposes while still providing some degree of privacy and light transmission. This statement highlights the functional properties of glass blocks, which are designed more for visual and functional characteristics rather than for structural integrity.

In a fire context, while glass blocks can potentially withstand heat to some degree, they are not intended to provide support or bear loads, which typically places them in the category of non-load-bearing materials. This has implications for their use in construction, especially when considering fire-resistance ratings and structural safety in fire situations. Understanding their role as non-load-bearing elements is crucial for firefighters when assessing the risks associated with structural collapse during fire operations.

The other statements describe characteristics or behaviors associated with glass blocks that might not be universally applicable or are oversimplified, leading to misunderstanding their actual utility and constraints.