真空(kong)(kong)(kong)(kong)(kong)，這一(yi)術(shu)語譯(yi)自拉丁文vacuo，其(qi)意義是虛無。其(qi)實真空(kong)(kong)(kong)(kong)(kong)應理解為氣體較稀薄的(de)空(kong)(kong)(kong)(kong)(kong)間(jian)(jian)。在指定的(de)空(kong)(kong)(kong)(kong)(kong)間(jian)(jian)內，低于一(yi)個(ge)大氣壓力(li)的(de)氣體狀態統稱(cheng)為真空(kong)(kong)(kong)(kong)(kong)。真空(kong)(kong)(kong)(kong)(kong)狀態下氣體稀薄程度(du)(du)稱(cheng)為真空(kong)(kong)(kong)(kong)(kong)度(du)(du)（degreeofvacuum），通常(chang)用壓力(li)值(zhi)表(biao)示。因此真空(kong)(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)實際上不是完全真空(kong)(kong)(kong)(kong)(kong)的(de)，采用真空(kong)(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)技術(shu)包(bao)(bao)裝(zhuang)(zhuang)的(de)食品容器內的(de)真空(kong)(kong)(kong)(kong)(kong)度(du)(du)通常(chang)在600-1333Pa。所以，又(you)將(jiang)真空(kong)(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)稱(cheng)為減(jian)壓包(bao)(bao)裝(zhuang)(zhuang)或排(pai)氣包(bao)(bao)裝(zhuang)(zhuang)。