真(zhen)空(kong)(kong)(kong)，這一術語(yu)譯(yi)自拉丁文vacuo，其意義是虛無。其實真(zhen)空(kong)(kong)(kong)應(ying)理解為(wei)(wei)氣(qi)(qi)體(ti)(ti)較稀(xi)薄的(de)空(kong)(kong)(kong)間。在(zai)(zai)指定的(de)空(kong)(kong)(kong)間內(nei)(nei)，低(di)于一個大氣(qi)(qi)壓力(li)的(de)氣(qi)(qi)體(ti)(ti)狀態統稱(cheng)為(wei)(wei)真(zhen)空(kong)(kong)(kong)。真(zhen)空(kong)(kong)(kong)狀態下氣(qi)(qi)體(ti)(ti)稀(xi)薄程度(du)(du)稱(cheng)為(wei)(wei)真(zhen)空(kong)(kong)(kong)度(du)(du)（degreeofvacuum），通常用壓力(li)值表(biao)示(shi)。因此真(zhen)空(kong)(kong)(kong)包(bao)(bao)裝(zhuang)實際上(shang)不是完全真(zhen)空(kong)(kong)(kong)的(de)，采用真(zhen)空(kong)(kong)(kong)包(bao)(bao)裝(zhuang)技術包(bao)(bao)裝(zhuang)的(de)食(shi)品容器內(nei)(nei)的(de)真(zhen)空(kong)(kong)(kong)度(du)(du)通常在(zai)(zai)600-1333Pa。所以，又(you)將真(zhen)空(kong)(kong)(kong)包(bao)(bao)裝(zhuang)稱(cheng)為(wei)(wei)減壓包(bao)(bao)裝(zhuang)或排氣(qi)(qi)包(bao)(bao)裝(zhuang)。