真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)，這一術(shu)語(yu)譯自拉丁文vacuo，其意義是虛(xu)無。其實真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)應理解(jie)為(wei)氣(qi)(qi)體(ti)較稀(xi)薄(bo)的(de)(de)(de)(de)(de)空(kong)(kong)(kong)(kong)(kong)間。在指定的(de)(de)(de)(de)(de)空(kong)(kong)(kong)(kong)(kong)間內，低于一個大氣(qi)(qi)壓力的(de)(de)(de)(de)(de)氣(qi)(qi)體(ti)狀態統稱為(wei)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)。真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)狀態下氣(qi)(qi)體(ti)稀(xi)薄(bo)程度稱為(wei)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)度（degreeofvacuum），通(tong)常用壓力值表示。因此(ci)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)實際(ji)上不是完全真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)的(de)(de)(de)(de)(de)，采用真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)技術(shu)包(bao)裝(zhuang)(zhuang)的(de)(de)(de)(de)(de)食品容器內的(de)(de)(de)(de)(de)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)度通(tong)常在600-1333Pa。所以，又(you)將真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)稱為(wei)減壓包(bao)裝(zhuang)(zhuang)或排(pai)氣(qi)(qi)包(bao)裝(zhuang)(zhuang)。