真(zhen)(zhen)空(kong)(kong)(kong)，這一術語譯自拉丁文vacuo，其意義是虛無。其實真(zhen)(zhen)空(kong)(kong)(kong)應理解(jie)為(wei)氣(qi)(qi)體較稀(xi)薄的(de)空(kong)(kong)(kong)間(jian)。在指定的(de)空(kong)(kong)(kong)間(jian)內，低于一個大氣(qi)(qi)壓(ya)力的(de)氣(qi)(qi)體狀態(tai)統稱(cheng)(cheng)為(wei)真(zhen)(zhen)空(kong)(kong)(kong)。真(zhen)(zhen)空(kong)(kong)(kong)狀態(tai)下氣(qi)(qi)體稀(xi)薄程度稱(cheng)(cheng)為(wei)真(zhen)(zhen)空(kong)(kong)(kong)度（degreeofvacuum），通常用(yong)壓(ya)力值(zhi)表示。因此真(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)(zhuang)實際上不是完全真(zhen)(zhen)空(kong)(kong)(kong)的(de)，采用(yong)真(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)(zhuang)技(ji)術包(bao)裝(zhuang)(zhuang)(zhuang)的(de)食品容(rong)器(qi)內的(de)真(zhen)(zhen)空(kong)(kong)(kong)度通常在600-1333Pa。所以(yi)，又將真(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)(zhuang)稱(cheng)(cheng)為(wei)減壓(ya)包(bao)裝(zhuang)(zhuang)(zhuang)或排(pai)氣(qi)(qi)包(bao)裝(zhuang)(zhuang)(zhuang)。