Knowra Outgassing Outgassing Outgassing is the release of gas from a material or body's interior or surface. It can result from heating, pressure changes, chemical reactions, or diffusion.
Desorption : The release of molecules or atoms from a surface into a surrounding gas or vacuum. Surface-bound molecules can leave by desorption as temperature rises or surrounding pressure falls.
Spacecraft contamination : The unwanted deposition or presence of material on spacecraft surfaces and instruments. Vapor released by spacecraft materials can condense on optics and degrade sensitive measurements.
Degassing : The removal or escape of dissolved gases from a liquid, melt, or solid. Degassing often names gas loss from magma or liquids, while outgassing also covers release from surfaces and solids.
Io (moon) : Jupiter’s volcanic moon, marked by intense volcanism and a thin sulfur dioxide atmosphere. Its atmosphere is replenished by volcanic emissions and partly collapses as surface temperatures change.
Atmospheric evolution : The long-term change in a planet’s atmospheric composition, pressure, and structure. Outgassing supplies gases that can accumulate, react, condense, or escape over geological time.
Diffusion : The net movement of particles from regions of higher concentration to regions of lower concentration. Gas dissolved inside a solid can migrate toward its surface by diffusion before escaping.
Vacuum engineering : The design and operation of systems that create and maintain pressures below atmospheric pressure. Vacuum systems must limit gas released by chamber walls, seals, and equipment.
Volcanism : The movement of magma and gases from a planetary interior to its surface or atmosphere. Volcanic emissions provide a major route by which planetary interiors release volatile substances.
Enceladus : A small icy moon of Saturn with water-rich plumes emerging from fractures near its south pole. Its plume provides direct evidence of gases and particles escaping from a subsurface ocean environment.
Greenhouse effect : The warming of a planet’s surface and lower atmosphere by gases that absorb and re-emit infrared radiation. Outgassed carbon dioxide and water vapor can strengthen greenhouse warming when retained in an atmosphere.
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