1. 
   vacuum chamber
   [n] - a chamber from which nearly all matter (especially air) has been removed
   Found op http://www.webdictionary.co.uk/definition.php?query=vacuum%20chamber
   
   
2. 
   vacuum chamber
   noun a chamber from which nearly all matter (especially air) has been removed
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=vacuum%20chamber
   
   
3. 
   Vacuum chamber
   A vacuum chamber is a rigid enclosure from which air and other gases are removed by a vacuum pump. The resulting low pressure, commonly referred to as a vacuum. A vacuum environment allows researchers to conduct physical experiments or to test mechanical devices which must operate in outer space (f...
   Found op http://en.wikipedia.org/wiki/Vacuum_chamber
   
   

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