真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)，這一術(shu)語譯(yi)自拉丁文vacuo，其意義(yi)是虛(xu)無。其實(shi)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)應理解(jie)為(wei)(wei)氣(qi)體(ti)較(jiao)稀(xi)(xi)薄(bo)的空(kong)(kong)(kong)間。在指(zhi)定的空(kong)(kong)(kong)間內，低(di)于(yu)一個大氣(qi)壓(ya)力(li)的氣(qi)體(ti)狀(zhuang)態(tai)統稱為(wei)(wei)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)。真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)狀(zhuang)態(tai)下氣(qi)體(ti)稀(xi)(xi)薄(bo)程度稱為(wei)(wei)真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)度（degreeofvacuum），通常(chang)(chang)用壓(ya)力(li)值(zhi)表示。因此真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)包裝(zhuang)實(shi)際上不是完全真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)的，采用真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)包裝(zhuang)技術(shu)包裝(zhuang)的食(shi)品容(rong)器內的真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)度通常(chang)(chang)在600-1333Pa。所以，又(you)將真(zhen)(zhen)(zhen)(zhen)空(kong)(kong)(kong)包裝(zhuang)稱為(wei)(wei)減壓(ya)包裝(zhuang)或(huo)排氣(qi)包裝(zhuang)。