Asked by Andy Blackwell Uncategorized
What is meant by outgassing?
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Asked in Roman Numerals
What is meant by outgassing and what modern phenomenon serves that role today?
Asked in Technology
How do you produce high vacuum?
Achieving high vacuum is difficult because all of the materials exposed to the vacuum must be carefully evaluated for their outgassing and vapor pressure properties.Ultra high vacuum generally requires custom built equipment, strict operational procedures, and a fair amount of trial and error . Ultra high vacuum systems are usually made of stainless steel with metal gasketed conflat flanges. The system is usually baked, preferably under vacuum, to temporarily raise the vapour pressure of all outgassing materials in the system and boil them off. If necessary, this outgassing of the system can also be performed at room temperature, but this takes much more time. Once the bulk of the outgassing materials are boiled off and evacuated, the system may be cooled to lower vapour pressures to minimize residual outgassing during actual operation. Some systems are cooled well below room temperature byliquid nitrogen to shut down residual outgassing and simultaneously cryopump the system.
Asked in Environmental Issues
Why did the giant ice caps in the Paleozoic era melt?
Asked in Plate Tectonics
What single factor explains why the planet should have active tectonics and volcanism and an atmosphere produced by volcanic outgassing?
Asked in Units of Measure, History of Science
Where do scientists believe the first gases in Earth's atmosphere came from?
Asked in Earth Sciences
List three reasons that Earth was hot when it formed?
Asked in Science
Did the elements in the atmosphere come from the erosion of rock and outgassing?
Asked in Volcanoes
What is volcanic outgassing?
Outgassing is the release of gases either trapped in liquid rock (magma) or generated by the contact of the heated rock with underground water. These gases include water vapor, carbon dioxide, sulfur dioxide, and hydrogen sulfide. The sulfur compounds are especially dangerous to humans and animals, and can lead to "acid rain" when released into the atmosphere. Superheated gases also form part of the heavy ash clouds called pyroclastic flows.
Asked in Apollo Moon Missions
What was the main mission of the lunar prospector?