真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)，這一術(shu)(shu)語譯自拉丁文(wen)vacuo，其意義是(shi)虛無。其實真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)應(ying)理解為氣(qi)體較稀薄(bo)的(de)(de)空(kong)(kong)(kong)(kong)間。在(zai)指定的(de)(de)空(kong)(kong)(kong)(kong)間內，低于一個大氣(qi)壓力的(de)(de)氣(qi)體狀態統稱(cheng)為真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)狀態下氣(qi)體稀薄(bo)程(cheng)度(du)稱(cheng)為真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)度(du)（degreeofvacuum），通常用(yong)壓力值表示(shi)。因此(ci)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)實際上不(bu)是(shi)完全(quan)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)的(de)(de)，采(cai)用(yong)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)技術(shu)(shu)包(bao)(bao)裝(zhuang)(zhuang)的(de)(de)食品容器(qi)內的(de)(de)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)度(du)通常在(zai)600-1333Pa。所以，又將真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)稱(cheng)為減壓包(bao)(bao)裝(zhuang)(zhuang)或排(pai)氣(qi)包(bao)(bao)裝(zhuang)(zhuang)。