Dessicator

This principle is used to protect moisture-sensitive samples and reagents from atmospheric moisture, ensuring their integrity and preventing unwanted reactions. 

Here's a more detailed explanation:

Desiccator Principle:

Creating a dry environment:

Desiccators are designed to create and maintain a low-humidity environment within the chamber by using a desiccant. 

Desiccant's role:

The desiccant, typically silica gel or calcium chloride, absorbs moisture from the surrounding air, preventing it from entering the sample. 

Airtight seal:

The desiccator is designed to be airtight, preventing outside moisture from entering the chamber and disrupting the dry environment. 

Protection of samples:

This dry environment protects samples, reagents, and other materials that are susceptible to moisture from being damaged or altered. 

Applications:

Desiccators are commonly used in laboratories to cool heated objects, store dry objects that need to be protected from moisture, and for specific experimental procedures like drying samples or achieving a specific level of humidity. 

In essence, the principle of a desiccator is to provide a controlled, low-humidity environment within an airtight container, using a desiccant to absorb and remove moisture, thus protecting sensitive samples and reagents from the effects 0of humidity.