真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)，這一術語譯(yi)自拉丁文(wen)vacuo，其意義是虛無。其實真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)應理(li)解為(wei)氣體(ti)(ti)較稀薄(bo)的(de)(de)空(kong)(kong)(kong)(kong)(kong)(kong)間。在(zai)指定的(de)(de)空(kong)(kong)(kong)(kong)(kong)(kong)間內(nei)，低于一個大氣壓力的(de)(de)氣體(ti)(ti)狀態統稱(cheng)為(wei)真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)。真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)狀態下氣體(ti)(ti)稀薄(bo)程(cheng)度稱(cheng)為(wei)真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度（degreeofvacuum），通(tong)常用壓力值表示。因此(ci)真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)包(bao)裝實際上(shang)不(bu)是完全真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)的(de)(de)，采用真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)包(bao)裝技術包(bao)裝的(de)(de)食品(pin)容器內(nei)的(de)(de)真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度通(tong)常在(zai)600-1333Pa。所以，又將真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)包(bao)裝稱(cheng)為(wei)減壓包(bao)裝或排(pai)氣包(bao)裝。