真(zhen)(zhen)(zhen)空(kong)(kong)(kong)，這一術語譯(yi)自拉丁文vacuo，其(qi)意義是(shi)虛無(wu)。其(qi)實真(zhen)(zhen)(zhen)空(kong)(kong)(kong)應(ying)理解(jie)為(wei)(wei)氣(qi)(qi)(qi)體(ti)較稀薄(bo)的(de)空(kong)(kong)(kong)間。在指定的(de)空(kong)(kong)(kong)間內，低于一個大氣(qi)(qi)(qi)壓(ya)力的(de)氣(qi)(qi)(qi)體(ti)狀態統稱(cheng)為(wei)(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)(kong)狀態下氣(qi)(qi)(qi)體(ti)稀薄(bo)程度稱(cheng)為(wei)(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)度（degreeofvacuum），通常用壓(ya)力值表示(shi)。因此真(zhen)(zhen)(zhen)空(kong)(kong)(kong)包裝實際上不(bu)是(shi)完全真(zhen)(zhen)(zhen)空(kong)(kong)(kong)的(de)，采用真(zhen)(zhen)(zhen)空(kong)(kong)(kong)包裝技術包裝的(de)食品(pin)容(rong)器內的(de)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)度通常在600-1333Pa。所以，又(you)將真(zhen)(zhen)(zhen)空(kong)(kong)(kong)包裝稱(cheng)為(wei)(wei)減壓(ya)包裝或排(pai)氣(qi)(qi)(qi)包裝。