The sudden breakage of a glass cup while it was placed in the sink can occur due to a variety of reasons, including:
Thermal shock: Glass can be sensitive to rapid temperature changes. If the glass cup was hot or warm from previous use, placing it directly in contact with cold water in the sink can cause thermal shock. This sudden temperature change can lead to stress on the glass, causing it to crack or shatter.
Structural weakness: Glassware, especially older or damaged pieces, can develop micro-fractures or weak spots over time. These imperfections may not be immediately visible to the naked eye, but they can compromise the structural integrity of the glass. Placing stress on these weakened areas, such as placing the glass in the sink or handling it, can cause it to break unexpectedly.
Impact or pressure: If the glass cup came into contact with a hard surface or was subjected to pressure while in the sink, it could have caused it to break. This can happen if the cup was accidentally hit by another dish or if something heavy was placed on top of it.
Manufacturing defect: In rare cases, glassware can have manufacturing defects that make them more prone to breakage. These defects may not be apparent until a stress point is reached, causing the glass to break.
While it may be difficult to determine the exact cause without more information, the above factors are common reasons for the sudden breakage of glassware. It's important to handle glassware with care, avoid sudden temperature changes, and inspect it for any visible cracks or damage before use.