真(zhen)空(kong)(kong)(kong)(kong)(kong)，這一術語譯自拉丁文vacuo，其(qi)意義是(shi)虛無。其(qi)實真(zhen)空(kong)(kong)(kong)(kong)(kong)應理解為(wei)氣(qi)體(ti)較稀薄的(de)空(kong)(kong)(kong)(kong)(kong)間。在指定的(de)空(kong)(kong)(kong)(kong)(kong)間內，低于一個大(da)氣(qi)壓力的(de)氣(qi)體(ti)狀態統稱為(wei)真(zhen)空(kong)(kong)(kong)(kong)(kong)。真(zhen)空(kong)(kong)(kong)(kong)(kong)狀態下氣(qi)體(ti)稀薄程度稱為(wei)真(zhen)空(kong)(kong)(kong)(kong)(kong)度（degreeofvacuum），通常用壓力值(zhi)表示(shi)。因此真(zhen)空(kong)(kong)(kong)(kong)(kong)包(bao)裝實際(ji)上不是(shi)完全真(zhen)空(kong)(kong)(kong)(kong)(kong)的(de)，采用真(zhen)空(kong)(kong)(kong)(kong)(kong)包(bao)裝技(ji)術包(bao)裝的(de)食品(pin)容器(qi)內的(de)真(zhen)空(kong)(kong)(kong)(kong)(kong)度通常在600-1333Pa。所以，又(you)將(jiang)真(zhen)空(kong)(kong)(kong)(kong)(kong)包(bao)裝稱為(wei)減壓包(bao)裝或排(pai)氣(qi)包(bao)裝。