Why do eggs crack when boiling?

In this brief article, we will answer  the question, “why do eggs crack when boiling?” We will also discuss related topics including “Is it okay to eat an egg that is cracked when boiling?” Moreover, we will discuss how you can boil eggs without cracking

Why do eggs crack when boiling?

The proteins in the egg white start to coagulate when they are heated, and the egg shell prevents the egg from expanding. As the egg heats up, the air inside the egg expands and causes the egg to crack. 

The eggshell is made of calcium carbonate, which is not very soluble in water. When the egg is heated, the calcium carbonate dissolves in the water and forms calcium hydroxide. This calcium hydroxide is less stable than calcium carbonate and tends to precipitate out of the solution. 

As the calcium hydroxide precipitates, it forms a network of microscopic cracks in the eggshell. These cracks allow the water vapor to escape from the egg, and as the water vapor escapes, it causes the egg to collapse. 

The proteins in the egg white also play a role in causing the egg to crack. As the egg white is heated, the proteins start to coagulate. This process is called denaturation. 

The egg white becomes more viscous as the proteins denature, and this increased viscosity makes it more difficult for the water vapor to escape from the egg. As the water vapor builds up inside the egg, it causes the egg to expand and eventually crack.

How can you cook hard-boiled eggs without cracking?

Place eggs in a saucepan and fill with cold water, covering the eggs by about an inch. Bring the water to a boil over medium heat. Once the water reaches a boil, remove the pan from the heat and let it sit for about 12 minutes.

Drain the eggs and place them in a bowl of ice water for a few minutes before peeling. 

To avoid cracking the eggs, make sure to add them to the saucepan before turning on the heat. Also, don’t let the water come to a rolling boil, as this can cause the eggs to crack. Finally, be careful when peeling the eggs, as the shells can be sharp.

Why is vinegar added when boiling eggs?

Vinegar is added to boiling water when cooking eggs because it helps the eggs to cook evenly and prevents them from sticking to the pan. The vinegar also helps to make the eggshells easier to peel off.

Is it okay to eat an egg that is cracked when boiling?

Yes, it is okay to eat an egg that has cracked while boiling. The egg will be safe to eat as long as the egg white and egg yolk are fully cooked.

If you are unsure if your egg is fully cooked, you can do a quick test by touching the yolk with a fork. If the yolk feels firm, then the egg is fully cooked. 

Another way to tell if an egg is fully cooked is to check the color of the yolk. If the yolk is a deep yellow color, then the egg is fully cooked. If the yolk is still a light yellow color, then the egg is not fully cooked.

Why are eggs left at room temperature before boiling?

Eggs are left at room temperature before boiling because if they are put into boiling water straight from the fridge, the outside of the egg will cook faster than the inside, resulting in an uneven cook. 

The ideal temperature for boiling an egg is around 70-80 degrees Celsius, so by leaving the egg out at room temperature for a little while before boiling, you can help to ensure that the entire egg cooks evenly.

How do you peel hard-boiled eggs?

There are a few ways to peel hard-boiled eggs. One way is to tap the egg on a countertop until there is a small crack all the way around the egg. Then, hold the egg under cold running water and peel the shell off. 

Another way is to roll the egg on a countertop until the shell is cracked all the way around. Then, hold the egg under cold running water and peel the shell off.

You can learn more on the health and nutrition of eggs here

Conclusion 

In this article, we have answered the question “why do eggs crack when boiling?” We have also discussed why eggs are left at room temperature before boiling. Moreover, we have discussed how to boil eggs without cracking them 

Hope you find this blog useful, in case of any questions, please let us know

Citations

https://foodwine.com/eggs-crack-when-boiling/

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.wikihow.com/Cook-Hard-Boiled-Eggs-Without-Cracking%3Famp%3D1&ved=2ahUKEwi9vPmv9Z_4AhUhMewKHczMDZsQFnoECCQQAQ&usg=AOvVaw1ZAqtSlWjF5D3cA1rlhEpd

https://www.google.com/url?sa=t&source=web&rct=j&url=https://survivalfreedom.com/why-is-vinegar-added-to-boiling-water-when-cooking-eggs/&ved=2ahUKEwisvpal9p_4AhXQqqQKHVXfAes4ChAWegQIEBAB&usg=AOvVaw2qGyr_95EPphe4-iGqBS6L

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Hi, I am Charlotte, I love cooking and in my previous life, I was a chef. I bring some of my experience to the recipes on this hub and answer your food questions.