Why do eggs crack when boiled?

Eggs can crack during the boiling process due to several common reasons. One primary cause is a sudden change in temperature, such as when cold eggs are placed directly into already boiling water. This significant temperature difference can create stress on the eggshell, leading to cracks. Additionally, eggs might crack due to impact with the bottom or sides of the pot during boiling, especially when the water is vigorously boiling. Overly strong boiling water itself is a contributing factor, as the intense movement of the water can cause eggs to collide with each other or the pot's surface. Finally, if the eggshell already has tiny, pre-existing hairline cracks, even if not visible to the naked eye, they will be more susceptible to cracking when exposed to high temperatures and pressure during boiling. Understanding these causes can help minimize the occurrence of cracked eggs during preparation.

Key points
* Sudden temperature changes.
* Impact with the pot's bottom.
* Vigorous boiling or pre-existing cracks.

Nguồn / Source: VnExpress - Sức khỏe