A fresh egg sinks in pure water whereas it floats in saturated salty water, this is

Question

Accepted Answer

The correct answer to the question is:

**3. due to higher density of the salty water**

### Explanation:

When we place a fresh egg in pure water, it sinks because the density of the egg is greater than that of the pure water. Fresh eggs typically have a density of about 1.03 g/cm³, while pure water has a density of 1.00 g/cm³. Since the egg is denser than the water, it sinks.

However, when the same egg is placed in saturated salty water, it floats. This phenomenon occurs because the density of saturated salty water is significantly higher than that of both the egg and pure water. The added salt increases the water's density, allowing the egg to float.

### Analysis of Other Options:

1. **Due to the fluid matter inside the egg shell**: This option is incorrect because the fluid matter inside the egg does not significantly affect the overall density of the egg in relation to the surrounding water. The egg's ability to sink or float is primarily determined by its overall density compared to the water.

2. **Due to higher density of the pure water**: This option is incorrect because pure water is not denser than the egg. In fact, the egg is denser than pure water, which is why it sinks in it.

3. **Because the egg shell is made up of calcium which is lighter than pure water**: This option is misleading. While the eggshell is made of calcium carbonate, which is a solid and does not float, the overall buoyancy of the egg in water is determined by the combined density of the egg and the water. The eggshell's material does not play a significant role in the floating or sinking behavior in this context.

In summary, the key concept here is buoyancy, which is determined by the relative densities of the objects and the fluids they are placed in. The fresh egg sinks in pure water due to its higher density, while it floats in saturated salty water due to the higher density of the salty water.