Do Boiled Eggs Float or Sink When Done?

Do Boiled Eggs Float or Sink When Done? Have you ever wondered if boiled eggs float or sink when they are done cooking? After experimenting with various methods to determine if an egg is cooked or not, a few techniques stood out. 

Despite popular belief, hard-boiled eggs do not float. However, they do exhibit distinct characteristics when you spin them or shine a flashlight through them. So, if you’re curious about the answer to this age-old question, read on to learn more about the fascinating world of boiled eggs and the secrets they hold.

How long should you boil eggs?

The perfect boiled egg should have a firm white and a creamy yolk, without any odors or discoloration. To achieve this, it is essential to boil the eggs for the right amount of time. 

For a standard large egg, it is generally recommended to boil for about 6-7 minutes for a soft-boiled egg with a runny yolk, and 9-12 minutes for a hard-boiled egg with a fully set yolk. However, the desired consistency may vary from person to person, so it’s important to adjust the cooking time according to personal preferences. 

Additionally, it is crucial to pay attention to the size of the eggs, as smaller or larger eggs may require slightly different cooking times. Overall, mastering the art of boiling eggs can result in a delicious and satisfying meal or snack.

How to keep hard-boiled eggs fresh for longer?

To ensure that hard-boiled eggs remain fresh for a longer period, it is crucial to store them appropriately. First, allow the boiled eggs to cool down to room temperature before peeling them.

After peeling, place the eggs in an airtight container and store them in the fridge. To prevent the eggs from absorbing other odors, it’s best to keep them in a single layer. Also, you can place a moist paper towel over the eggs to help maintain their freshness and moisture. 

Properly stored hard-boiled eggs can last in the fridge for up to one week. Before consuming the eggs, check for any signs of spoilage, such as a foul odor or slimy texture. By following these simple steps, you can ensure that your hard-boiled eggs remain fresh and safe to eat for an extended period.

Scientific Explanation Behind Floating and Sinking:

The scientific explanation behind the phenomenon of floating and sinking is the concept of buoyancy. Buoyancy is a force that objects experience when they are submerged in a fluid, such as water. 

This force is created due to the pressure differences between the top and bottom of an object in the fluid. If an object is less dense than the fluid, it will float because the buoyant force pushing it up is greater than the weight pushing it down. 

On the other hand, if an object is more dense than the fluid, it will sink because the weight of the object is greater than the buoyant force acting on it. This explains why objects like wood, which are less dense than water, float while objects like metal, which are more dense than water, sink. Understanding the principles of buoyancy helps to explain why different objects display different behaviors when placed in water.


When boiling eggs, their floating or sinking behavior can help determine whether they are properly cooked. Generally, freshly boiled eggs will sink, while older eggs with larger air cells will float. However, it is crucial to consider other factors and use additional methods to guarantee that eggs are cooked thoroughly for both safety and the desired texture.

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