真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)，這一(yi)術(shu)語譯自拉丁文vacuo，其(qi)(qi)意(yi)義(yi)是虛無。其(qi)(qi)實真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)應理解為(wei)氣體(ti)較稀薄(bo)的(de)空(kong)(kong)(kong)(kong)(kong)間(jian)(jian)。在(zai)指定的(de)空(kong)(kong)(kong)(kong)(kong)間(jian)(jian)內，低于一(yi)個大氣壓力的(de)氣體(ti)狀態統稱為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)狀態下氣體(ti)稀薄(bo)程度(du)稱為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)度(du)（degreeofvacuum），通(tong)常用壓力值表示。因此真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)(zhuang)實際上不是完全真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)的(de)，采(cai)用真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)(zhuang)技術(shu)包(bao)裝(zhuang)(zhuang)(zhuang)的(de)食品容器內的(de)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)度(du)通(tong)常在(zai)600-1333Pa。所(suo)以，又將真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)(zhuang)稱為(wei)減壓包(bao)裝(zhuang)(zhuang)(zhuang)或(huo)排氣包(bao)裝(zhuang)(zhuang)(zhuang)。