Why do eggs burst when you boil them?

Eggs don't usually burst when you boil them, but they can crack. Here's why:

1. Temperature Changes:

* Rapid heating: When an egg is plunged into boiling water, the outside heats up much faster than the inside. This creates pressure as the inside expands, which can cause the shell to crack.

* Sudden cooling: If you remove a boiled egg from boiling water and immediately plunge it into cold water, the temperature difference can also cause the shell to crack.

2. Shell Integrity:

* Old eggs: Older eggs have a weaker shell, making them more prone to cracking.

* Cracked eggs: If the egg already has a crack, boiling it will likely cause it to burst.

* Thin shells: Some breeds of chickens lay eggs with thinner shells, which are more susceptible to cracking.

3. Boiling Process:

* Overboiling: Boiling eggs for too long can cause the yolk to expand and put pressure on the shell.

* Crowded pot: Boiling too many eggs in a small pot can lead to bumping and jostling, which increases the risk of cracking.

To prevent eggs from cracking while boiling:

* Start with cold water: This allows the egg to heat up gradually, reducing pressure build-up.

* Add salt to the water: This helps strengthen the egg shell and makes it less likely to crack.

* Don't overcook: Follow the recommended cooking time for your desired level of doneness.

* Avoid overcrowding the pot: Leave space between the eggs so they have room to move without bumping.

* Cool the eggs gradually: After boiling, transfer the eggs to a bowl of cold water instead of immediately plunging them into ice water.

By following these tips, you can enjoy perfectly boiled eggs without any messy bursts!