What is crazing of glass?

Crazing of glass refers to the formation of small, fine cracks on the surface of glass due to rapid changes in temperature. This phenomenon occurs when glass is subjected to extreme heat or thermal shock, causing uneven expansion and contraction. The micro-cracks may not penetrate all the way through the glass, but they can affect its aesthetic appearance and structural integrity. Understanding crazing is important in fire dynamics and safety, especially when assessing the condition of glass in environments exposed to high temperatures.

The other choices do not accurately describe crazing; they instead refer to characteristics or types of glass unrelated to the specific process of crack formation due to thermal stress.