Drying
Drying
Drying (/ˈdraɪɪŋ/) is a mass transfer process consisting of the removal of water or another solvent by evaporation from a solid, semi-solid or liquid. This process is often used as a final production step before selling or packaging products.
Etymology
The term "drying" comes from the Old English dryge, meaning "free from water".
Process
To speed up the drying process, air is usually blown over the material, or the material is heated. In biological systems such as drying of cereal grains, the main mechanism is diffusion through the cell wall.
Types of Drying
There are several types of drying methods that can be used, including:
- Air drying: This is the process of removing water from a substance by exposing it to air.
- Freeze drying: This is a method of drying where the water is first frozen and then removed by sublimation.
- Vacuum drying: This is a method of drying where the pressure is reduced to lower the evaporation point of the water.
Related Terms
- Dehydration: The process of removing water from a substance or organism.
- Desiccation: The state of extreme dryness, or the process of extreme drying.
- Evaporation: The process by which water changes from a liquid to a gas or vapor.
- Sublimation: The transition of a substance directly from the solid to the gas state, without passing through the liquid state.
See Also
External links
- Medical encyclopedia article on Drying
- Wikipedia's article - Drying
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