真(zhen)(zhen)空(kong)(kong)(kong)(kong)，這一(yi)術(shu)語譯自(zi)拉(la)丁文vacuo，其(qi)意義(yi)是虛(xu)無。其(qi)實(shi)真(zhen)(zhen)空(kong)(kong)(kong)(kong)應理解為(wei)氣體較(jiao)稀(xi)薄的(de)(de)空(kong)(kong)(kong)(kong)間。在(zai)(zai)指定的(de)(de)空(kong)(kong)(kong)(kong)間內，低于一(yi)個(ge)大氣壓力的(de)(de)氣體狀態(tai)統稱(cheng)為(wei)真(zhen)(zhen)空(kong)(kong)(kong)(kong)。真(zhen)(zhen)空(kong)(kong)(kong)(kong)狀態(tai)下氣體稀(xi)薄程度稱(cheng)為(wei)真(zhen)(zhen)空(kong)(kong)(kong)(kong)度（degreeofvacuum），通常用壓力值表示。因此真(zhen)(zhen)空(kong)(kong)(kong)(kong)包裝(zhuang)(zhuang)實(shi)際上不是完全(quan)真(zhen)(zhen)空(kong)(kong)(kong)(kong)的(de)(de)，采用真(zhen)(zhen)空(kong)(kong)(kong)(kong)包裝(zhuang)(zhuang)技術(shu)包裝(zhuang)(zhuang)的(de)(de)食(shi)品容(rong)器(qi)內的(de)(de)真(zhen)(zhen)空(kong)(kong)(kong)(kong)度通常在(zai)(zai)600-1333Pa。所以，又將真(zhen)(zhen)空(kong)(kong)(kong)(kong)包裝(zhuang)(zhuang)稱(cheng)為(wei)減壓包裝(zhuang)(zhuang)或排氣包裝(zhuang)(zhuang)。