真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)，這一(yi)術語譯自拉丁文vacuo，其意(yi)義是虛無。其實真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)應理(li)解為(wei)氣(qi)體較(jiao)稀薄的(de)空(kong)(kong)(kong)(kong)間。在(zai)指定的(de)空(kong)(kong)(kong)(kong)間內，低于一(yi)個大氣(qi)壓(ya)力(li)的(de)氣(qi)體狀態(tai)統稱為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)狀態(tai)下氣(qi)體稀薄程度稱為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)度（degreeofvacuum），通(tong)常用(yong)壓(ya)力(li)值表示。因(yin)此真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)實際上不(bu)是完全(quan)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)的(de)，采用(yong)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)技(ji)術包(bao)(bao)裝(zhuang)的(de)食品容器內的(de)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)度通(tong)常在(zai)600-1333Pa。所以，又(you)將真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)稱為(wei)減(jian)壓(ya)包(bao)(bao)裝(zhuang)或排(pai)氣(qi)包(bao)(bao)裝(zhuang)。