真(zhen)(zhen)空(kong)(kong)(kong)，這一術(shu)(shu)語譯自拉丁文vacuo，其(qi)意(yi)義(yi)是虛無。其(qi)實真(zhen)(zhen)空(kong)(kong)(kong)應(ying)理解(jie)為氣(qi)體較稀(xi)薄的(de)空(kong)(kong)(kong)間。在指定的(de)空(kong)(kong)(kong)間內(nei)，低于一個大氣(qi)壓力的(de)氣(qi)體狀態統稱為真(zhen)(zhen)空(kong)(kong)(kong)。真(zhen)(zhen)空(kong)(kong)(kong)狀態下氣(qi)體稀(xi)薄程度(du)稱為真(zhen)(zhen)空(kong)(kong)(kong)度(du)（degreeofvacuum），通(tong)常用(yong)壓力值表示。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)技術(shu)(shu)包(bao)裝(zhuang)(zhuang)(zhuang)的(de)食品容器內(nei)的(de)真(zhen)(zhen)空(kong)(kong)(kong)度(du)通(tong)常在600-1333Pa。所以，又(you)將真(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)(zhuang)稱為減(jian)壓包(bao)裝(zhuang)(zhuang)(zhuang)或排氣(qi)包(bao)裝(zhuang)(zhuang)(zhuang)。