Eggshells are porous. They breathe. Air seeps in over time. Water evaporates out.
This makes the inside shrink. The air pocket grows. Buoyancy is a bully—it pushes the lighter thing up.
You don’t need a lab coat. You just need a glass of tap water. This is kitchen physics for lazy geniuses.
Quirky Facts to Drop at Parties
Ancient Romans used this test. They kept eggs in olive oil to seal the shells. Smart folks.
Farmers test eggs this way every morning. They can tell you the exact day an egg was laid. Show-offs.
If an egg tilts but doesn’t stand, it’s about a week old. It’s like a mood ring for poultry.
You can also shake the egg. Fresh ones are silent. Old ones slosh like a tiny cocktail. Don’t drink that cocktail.
