kaasunpoistossa

Kaasunpoisto, known in English as degassing, is a process used to remove dissolved gases from liquids or solids. This is often necessary in various industrial and scientific applications to improve the quality or properties of a material. In the context of liquids, dissolved gases can affect viscosity, surface tension, and stability. For instance, in the production of plastics and polymers, degassing is crucial to eliminate trapped air or other gases that could lead to voids or defects in the final product. This is often achieved through vacuum degassing, where the material is placed in a low-pressure environment, causing the dissolved gases to bubble out and escape.

Another common method for liquid degassing is sparging, where an inert gas, such as nitrogen, is bubbled through the liquid. The inert gas displaces the dissolved gases, which then escape with the sparging gas. This technique is frequently employed in water treatment to remove dissolved oxygen, which can cause corrosion. In the food and beverage industry, degassing can be used to remove dissolved carbon dioxide from products like beer or soda to prevent excessive foaming during packaging or consumption.

In solid materials, degassing can refer to the release of trapped gases within a porous structure. This is particularly relevant in metallurgy, where gases like hydrogen or nitrogen can be absorbed by molten metals and become trapped during solidification, leading to embrittlement. Heat treatment under vacuum or controlled atmospheres is often used to remove these trapped gases. Similarly, in the context of geological studies, degassing refers to the release of gases from the Earth's interior, such as in volcanic eruptions or through hydrothermal vents.