真(zhen)空(kong)(kong)(kong)，這一術(shu)語譯自拉丁文vacuo，其意(yi)義是虛無。其實(shi)真(zhen)空(kong)(kong)(kong)應理(li)解(jie)為(wei)(wei)氣(qi)體(ti)較稀(xi)薄(bo)的(de)(de)(de)空(kong)(kong)(kong)間(jian)。在指定(ding)的(de)(de)(de)空(kong)(kong)(kong)間(jian)內，低于一個大(da)氣(qi)壓力的(de)(de)(de)氣(qi)體(ti)狀態統稱(cheng)(cheng)為(wei)(wei)真(zhen)空(kong)(kong)(kong)。真(zhen)空(kong)(kong)(kong)狀態下氣(qi)體(ti)稀(xi)薄(bo)程度(du)稱(cheng)(cheng)為(wei)(wei)真(zhen)空(kong)(kong)(kong)度(du)（degreeofvacuum），通常(chang)用壓力值表示。因(yin)此(ci)真(zhen)空(kong)(kong)(kong)包(bao)(bao)(bao)裝(zhuang)實(shi)際上不(bu)是完全真(zhen)空(kong)(kong)(kong)的(de)(de)(de)，采用真(zhen)空(kong)(kong)(kong)包(bao)(bao)(bao)裝(zhuang)技(ji)術(shu)包(bao)(bao)(bao)裝(zhuang)的(de)(de)(de)食(shi)品容器(qi)內的(de)(de)(de)真(zhen)空(kong)(kong)(kong)度(du)通常(chang)在600-1333Pa。所以，又(you)將真(zhen)空(kong)(kong)(kong)包(bao)(bao)(bao)裝(zhuang)稱(cheng)(cheng)為(wei)(wei)減壓包(bao)(bao)(bao)裝(zhuang)或(huo)排氣(qi)包(bao)(bao)(bao)裝(zhuang)。