真(zhen)空(kong)(kong)(kong)(kong)，這一術(shu)語(yu)譯自拉丁文vacuo，其(qi)意義(yi)是虛無。其(qi)實真(zhen)空(kong)(kong)(kong)(kong)應理(li)解為氣(qi)(qi)體較稀薄的(de)空(kong)(kong)(kong)(kong)間。在(zai)指定的(de)空(kong)(kong)(kong)(kong)間內，低于一個大氣(qi)(qi)壓(ya)力(li)的(de)氣(qi)(qi)體狀(zhuang)態統稱(cheng)為真(zhen)空(kong)(kong)(kong)(kong)。真(zhen)空(kong)(kong)(kong)(kong)狀(zhuang)態下氣(qi)(qi)體稀薄程度(du)稱(cheng)為真(zhen)空(kong)(kong)(kong)(kong)度(du)（degreeofvacuum），通(tong)常用(yong)壓(ya)力(li)值(zhi)表示(shi)。因此真(zhen)空(kong)(kong)(kong)(kong)包(bao)裝(zhuang)實際上不是完全真(zhen)空(kong)(kong)(kong)(kong)的(de)，采用(yong)真(zhen)空(kong)(kong)(kong)(kong)包(bao)裝(zhuang)技術(shu)包(bao)裝(zhuang)的(de)食(shi)品(pin)容器內的(de)真(zhen)空(kong)(kong)(kong)(kong)度(du)通(tong)常在(zai)600-1333Pa。所以，又將真(zhen)空(kong)(kong)(kong)(kong)包(bao)裝(zhuang)稱(cheng)為減壓(ya)包(bao)裝(zhuang)或排(pai)氣(qi)(qi)包(bao)裝(zhuang)。