Desiccant
Desiccant
Desiccant (/dɪˈsɪkənt/) is a substance that is used to induce or sustain a state of dryness (desiccation) in its vicinity. It is commonly used to absorb moisture and reduce humidity in enclosed spaces, thus preventing damage to goods and products that are sensitive to moisture.
Etymology
The term "desiccant" is derived from the Latin word "desiccare," which means "to dry up."
Types of Desiccants
There are several types of desiccants, each with their own properties and uses. Some of the most common types include:
- Silica gel: This is perhaps the most well-known desiccant. It is often found in small packets accompanying products that need to be kept dry.
- Calcium sulfate: This desiccant is commonly used in the food industry due to its non-toxic nature.
- Calcium chloride: This is a powerful desiccant used in large-scale operations, such as shipping containers.
- Molecular sieves: These are synthetic desiccants that have very small, uniform pores, allowing them to absorb moisture very effectively.
Uses of Desiccants
Desiccants are used in a wide range of applications, including:
- Food storage: Desiccants can help to extend the shelf life of food by reducing moisture and preventing the growth of mold and bacteria.
- Pharmaceuticals: Many pharmaceutical products are sensitive to moisture and require desiccants to maintain their efficacy.
- Electronics: Moisture can cause corrosion and other damage to electronic components, so desiccants are often used in packaging to keep them dry.
- Chemical industry: Desiccants are used in various chemical processes, such as the drying of solvents.
Related Terms
- Humidity: The amount of water vapor present in the air.
- Hygroscopy: The ability of a substance to attract and hold water molecules from the surrounding environment.
- Moisture: The presence of water or other liquid, often in trace amounts.
External links
- Medical encyclopedia article on Desiccant
- Wikipedia's article - Desiccant
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