Fresh eggs should sink in water, while older eggs may float.
The Egg Float Test Explained
The ability of an egg to float or sink is a simple way to gauge its freshness. This is commonly known as the "egg float test".
How the Egg Float Test Works
- Gently place an egg in a bowl or bucket of water.
- Observe whether the egg sinks, tilts upwards, or floats.
| Result | Implication |
|---|---|
| Sinks | Fresh Egg |
| Tilts Upwards | Older, but potentially usable |
| Floats | Old Egg |
As an egg ages, moisture inside is released and replaced by air, increasing the size of the air pocket. The increased air pocket makes the egg less dense, causing it to float. The reference states: "If the egg sinks, it is fresh. If it tilts upwards or even floats, it is old. This is because as an egg ages, the small air pocket inside it grows larger as water is released and replaced by air."
Why Fresh Eggs Sink
Fresh eggs contain minimal air inside, making them dense enough to sink to the bottom of a container of water. A sinking egg is an indication that the egg is fresh.
Why Old Eggs Float
- As eggs age, moisture escapes through the porous shell.
- This moisture is replaced by air, increasing the size of the internal air pocket.
- The larger air pocket reduces the egg's overall density.
- A less dense egg will float more easily.
Practical Tips for Using the Float Test
- Use a clear container to easily observe the egg's behavior.
- Gently place the egg into the water to avoid cracking it.
- While the float test is a good indicator, it's also best to check the "best before" or "use by" date on the egg carton.
