真(zhen)(zhen)空(kong)(kong)(kong)(kong)，這(zhe)一術(shu)語譯(yi)自拉丁文vacuo，其意義是虛無。其實真(zhen)(zhen)空(kong)(kong)(kong)(kong)應理解為(wei)(wei)氣(qi)(qi)(qi)體(ti)(ti)較稀薄(bo)的空(kong)(kong)(kong)(kong)間。在指定的空(kong)(kong)(kong)(kong)間內，低(di)于一個大氣(qi)(qi)(qi)壓力(li)的氣(qi)(qi)(qi)體(ti)(ti)狀(zhuang)態統稱(cheng)(cheng)為(wei)(wei)真(zhen)(zhen)空(kong)(kong)(kong)(kong)。真(zhen)(zhen)空(kong)(kong)(kong)(kong)狀(zhuang)態下(xia)氣(qi)(qi)(qi)體(ti)(ti)稀薄(bo)程度(du)稱(cheng)(cheng)為(wei)(wei)真(zhen)(zhen)空(kong)(kong)(kong)(kong)度(du)（degreeofvacuum），通(tong)(tong)常用(yong)壓力(li)值(zhi)表示。因此真(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)裝(zhuang)實際上不(bu)是完全真(zhen)(zhen)空(kong)(kong)(kong)(kong)的，采用(yong)真(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)裝(zhuang)技(ji)術(shu)包(bao)裝(zhuang)的食品容器(qi)內的真(zhen)(zhen)空(kong)(kong)(kong)(kong)度(du)通(tong)(tong)常在600-1333Pa。所以，又將真(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)裝(zhuang)稱(cheng)(cheng)為(wei)(wei)減壓包(bao)裝(zhuang)或排氣(qi)(qi)(qi)包(bao)裝(zhuang)。