The Float Test The water test is a simple way to check if an egg is still fresh. Place the egg in a glass of water—if it sinks to the bottom and lies flat on its side, it's fresh.
Sinking Upright If the egg sinks but stands upright on the bottom of the glass, it's still safe to eat but nearing the end of its freshness. This means it's older, but not yet spoiled.
Floating Indicates Expiration If the egg floats to the surface, it is likely expired. The air pocket inside the egg grows as it ages, causing it to become buoyant and float.
Why It Works Eggs have a small air cell inside them that increases over time as moisture and carbon dioxide escape. The larger the air cell, the older the egg, which is why it will float when expired.
Quick and Reliable Method The water test is a quick and reliable method that requires no special equipment. It’s a tried-and-true technique used for decades to determine egg freshness.
No Impact on Egg Quality Performing the water test doesn’t affect the quality or safety of the egg. After the test, you can immediately cook with the egg if it passes by sinking.
Other Signs of Spoilage In addition to floating, an expired egg may have a foul odor or a discolored yolk and white when cracked open. Always combine the float test with these visual and smell cues to ensure the egg is safe to consume.
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