Dewarsäiliöillä

Dewarsäiliöillä, often referred to as Dewar flasks or vacuum flasks, are insulated containers designed to store and transport very low-temperature substances like liquid nitrogen and liquid helium. They utilize a vacuum between their inner and outer walls to minimize heat transfer, thereby keeping the contents cold for extended periods. The principle of operation relies on reducing heat conduction, convection, and radiation. The vacuum layer significantly hinders conduction and convection, while reflective coatings on the inner surfaces of the walls help to reflect thermal radiation away from the contents.

These containers are typically constructed from materials like stainless steel or glass, with a robust outer casing for durability and safety. The neck of the Dewar is usually narrow to further minimize heat loss through evaporation. They come in various sizes, from small laboratory flasks to large industrial vessels, catering to different needs. Dewarsäiliöillä are essential tools in scientific research, medical applications, and industrial processes where the preservation of cryogenic substances is critical. Their ability to maintain extremely low temperatures without constant refrigeration makes them invaluable for storing biological samples, transporting supercooled materials, and facilitating experiments requiring cryogenic conditions.