1. The Float Test: Science You Can Trust
Yes, it sounds like a middle school experiment—but the egg float test is legit. Here’s how it works:
Fill a bowl with cold water (enough to submerge an egg).
Gently place the egg in the water.
How to Tell If an Egg Has Gone Bad—3 Foolproof Tests (Plus What “Expired” Really Means)
Watch what it does:
Sinks and lies flat on the bottom?
→ Very fresh—perfect for poaching, soft-boiling, or delicate dishes like custards.
Sinks but stands upright on the bottom?
→ Older but still safe to eat—great for hard-boiling, scrambling, or baking. Use within a day or two.
Floats to the surface?
→ Toss it. That air pocket inside has grown so large (from evaporation and gas buildup) that the egg is likely spoiled. Don’t crack it—just discard.
Why it works:
continued on next page Why it works: As eggs age, moisture and carbon dioxide escape through the shell’s pores, enlarging the air cell. A floating egg = too much air = potential bacterial growth.
BiologicalSciences
2. The Sniff Test: Your Nose Knows Best
Never skip this one—especially if you’ve already cracked the egg.
Fresh eggs have little to no odor.
Watch what it does:
Sinks and lies flat on the bottom?
→ Very fresh—perfect for poaching, soft-boiling, or delicate dishes like custards.
Sinks but stands upright on the bottom?
→ Older but still safe to eat—great for hard-boiling, scrambling, or baking. Use within a day or two.
Floats to the surface?
→ Toss it. That air pocket inside has grown so large (from evaporation and gas buildup) that the egg is likely spoiled. Don’t crack it—just discard.
Why it works:
continued on next page Why it works: As eggs age, moisture and carbon dioxide escape through the shell’s pores, enlarging the air cell. A floating egg = too much air = potential bacterial growth.
BiologicalSciences
2. The Sniff Test: Your Nose Knows Best
Never skip this one—especially if you’ve already cracked the egg.
Fresh eggs have little to no odor.
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