Why is the glass bottle held in a place inside metal case with help of cork pieces?

It sounds like you're describing a classic method for protecting glass bottles, particularly those containing fragile items like perfume or essential oils. Here's why the cork pieces and metal case are used:

* Protection: The primary reason is protection. The metal case acts as a rigid outer shell, shielding the glass bottle from impact, drops, and other external forces. The cork pieces serve as a cushion, absorbing shock and preventing the bottle from rattling around inside the case.

* Shock Absorption: Cork is an excellent material for shock absorption. Its natural cellular structure compresses and rebounds effectively, distributing force and minimizing the impact on the glass bottle.

* Sealing: Cork also helps create a snug fit, ensuring the bottle stays securely in place. This is especially important for delicate items that could be damaged by movement.

* Preservation: For some items like perfumes, the cork pieces can also help prevent evaporation or oxidation, maintaining the quality of the product over time.

Example: This method is often used in traditional apothecary or perfume bottles. The combination of the metal case and cork pieces creates a protective environment that preserves the contents and ensures the bottle arrives intact.

Let me know if you have any other questions!