真(zhen)(zhen)(zhen)空(kong)(kong)(kong)，這一(yi)術語譯自拉丁(ding)文vacuo，其(qi)意(yi)義是虛無。其(qi)實(shi)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)應(ying)理解為(wei)氣(qi)(qi)體較稀薄的(de)空(kong)(kong)(kong)間(jian)(jian)。在指定(ding)的(de)空(kong)(kong)(kong)間(jian)(jian)內，低于一(yi)個大氣(qi)(qi)壓(ya)(ya)力的(de)氣(qi)(qi)體狀態統稱(cheng)(cheng)為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)(kong)狀態下氣(qi)(qi)體稀薄程度稱(cheng)(cheng)為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)度（degreeofvacuum），通常用(yong)壓(ya)(ya)力值表示。因(yin)此真(zhen)(zhen)(zhen)空(kong)(kong)(kong)包(bao)(bao)裝(zhuang)實(shi)際上(shang)不(bu)是完(wan)全(quan)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)的(de)，采用(yong)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)包(bao)(bao)裝(zhuang)技術包(bao)(bao)裝(zhuang)的(de)食品容器內的(de)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)度通常在600-1333Pa。所以，又將(jiang)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)包(bao)(bao)裝(zhuang)稱(cheng)(cheng)為(wei)減壓(ya)(ya)包(bao)(bao)裝(zhuang)或排氣(qi)(qi)包(bao)(bao)裝(zhuang)。