evacuate, evacuating, evacuated 1. To leave empty; to vacate. 2. To remove (persons or things) from a place, as a dangerous place or disaster area, for reasons of safety or protection: 'They had to evacuate the inhabitants of towns in the path of a flood.' 3. To remove people from (a city, town, building, area, etc.) for reasons of safety: 'The emb... Found on http://www.wordinfo.info/words/index/info/view_unit/2258/
Sealed and pumped down to a pressure very much below atmospheric pressure. Typical pressures inside accelerators or waveguides are about 10-12 times atmospheric pressure. Found on https://www.encyclo.co.uk/local/21257