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Specialized vacuum chambers, called vacuum degassers, are used to degas materials through pressure reduction. In this laboratory-scale technique, the fluid to be degassed is placed in a Schlenk flask and flash-frozen, usually with liquid nitrogen. — “Degasification - Wikipedia, the free encyclopedia”, en.wikipedia.org
Degassed DI water is often used as a temporary dielectric for high power pulses lasting microseconds or less. DI water's combination of short term dielectric strength and high dielectric constant allow it to briefly store huge amounts of energy. — “Talk:Deionized water - Wikipedia, the free encyclopedia”, en.wikipedia.org
The main disadvantage to this process is the high price for the equipment. The raw material is mixed and degassed and then poured into the mold. — “Vacuum casting (elastomers) - Wikipedia, the free encyclopedia”, en.wikipedia.org