What is the lifespan of a chicken egg?

The lifespan of a chicken egg depends on several factors, but here's a general guideline:

Unrefrigerated:

* At room temperature (70°F/21°C): 1-2 weeks. The egg will start to deteriorate quickly, especially in warm environments.

* In a cooler environment (55°F/13°C): Up to 3 weeks.

Refrigerated:

* Refrigerated (40°F/4°C): 3-5 weeks. This is the ideal storage temperature and will significantly extend the lifespan of the egg.

Important Note:

* Freshness doesn't always equate to safety. Even if an egg is within its lifespan, it's important to check for signs of spoilage, such as a cracked shell, a foul odor, or a cloudy yolk.

* Eggs can be safely frozen for up to a year. However, the texture will change after thawing, and they are best used in baked goods or recipes where texture is less important.

Here's a breakdown of the changes that occur in eggs over time:

* Within the first week: Eggs will lose some moisture and their air cell will increase in size.

* After two weeks: The egg white will become thinner, and the yolk will start to flatten.

* After three weeks: The egg will become significantly less fresh, and the yolk will become more watery.

Ultimately, the best way to determine if an egg is still good is to use the "float test". Place the egg in a bowl of water. If it sinks to the bottom and lays flat, it is fresh. If it stands on end, it is getting older. If it floats, it is likely spoiled and should be discarded.