isochoric
  等體的
  iso·chor·ic /ˌaɪsəˈkɔrɪk/ 形容詞
  等容的,等體積的
  I·so·chor n.   Physics A line upon a thermodynamic diagram so drawn as to represent the pressures corresponding to changes of temperature when the volume of the gas operated on is constant. -- I*so*chor*ic a.
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