The concentration of water in an egg is approximately 74%. This means that about three-quarters of an egg's weight is made up of water.

Here's a breakdown of the components of an egg:

* Water: ~74%

* Protein: ~13%

* Fat: ~11%

* Minerals: ~1%

* Other: ~1%

It's important to note that the exact concentration of water can vary slightly depending on the type of egg (e.g., chicken, duck), the age of the egg, and its storage conditions.