真空(kong)(kong)(kong)(kong)(kong)，這一術語譯(yi)自拉丁文(wen)vacuo，其意義(yi)是虛無。其實真空(kong)(kong)(kong)(kong)(kong)應理解(jie)為(wei)(wei)氣(qi)(qi)(qi)體較稀薄的(de)(de)空(kong)(kong)(kong)(kong)(kong)間。在指(zhi)定的(de)(de)空(kong)(kong)(kong)(kong)(kong)間內，低于一個大(da)氣(qi)(qi)(qi)壓(ya)力的(de)(de)氣(qi)(qi)(qi)體狀態統稱(cheng)為(wei)(wei)真空(kong)(kong)(kong)(kong)(kong)。真空(kong)(kong)(kong)(kong)(kong)狀態下氣(qi)(qi)(qi)體稀薄程度(du)稱(cheng)為(wei)(wei)真空(kong)(kong)(kong)(kong)(kong)度(du)（degreeofvacuum），通常用壓(ya)力值表示。因此真空(kong)(kong)(kong)(kong)(kong)包裝(zhuang)(zhuang)實際上(shang)不(bu)是完全真空(kong)(kong)(kong)(kong)(kong)的(de)(de)，采用真空(kong)(kong)(kong)(kong)(kong)包裝(zhuang)(zhuang)技術包裝(zhuang)(zhuang)的(de)(de)食品容器內的(de)(de)真空(kong)(kong)(kong)(kong)(kong)度(du)通常在600-1333Pa。所以，又(you)將真空(kong)(kong)(kong)(kong)(kong)包裝(zhuang)(zhuang)稱(cheng)為(wei)(wei)減壓(ya)包裝(zhuang)(zhuang)或排(pai)氣(qi)(qi)(qi)包裝(zhuang)(zhuang)。