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Old 22nd November 2009 | 08:55
  #6 (permalink)  
toolowtoofast
 
Joined: Aug 2007
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From: Godzone
apparantley it's about the volume of the gas at the time the energy is asked to do its work (ie at TDC)

http://www.grc.nasa.gov/WWW/K-12/airplane/otto.html
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