A fresh egg will float in water .

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Question

What physical property of a liquid determines whether an object will float or sink in it?

Answer

Density.

Question

Adding salt to water increases its density. What principle explains why this helps an egg float?

Answer

Archimedes' principle / Buoyancy.

Question

In plain water, a fresh egg sinks. Why does an old egg often float instead?

Answer

An air cell inside the egg expands over time, decreasing the egg's overall density.

Question

What is a common, simple home test to check an egg's freshness using water?

Answer

Place it in a bowl of plain water; if it sinks and lies flat, it's fresh.

Question

What is the term for the upward force exerted by a fluid that opposes the weight of an immersed object?

Answer

Buoyant force.

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Will a fresh, uncracked egg float in a glass of pure, unsalted water?

A fresh egg will float in water when salt is added because the added salt increases the water's density, making it easier for the egg to float.