真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)，這一術語譯自拉丁文vacuo，其意義是虛無。其實真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)應理解(jie)為(wei)氣(qi)體(ti)較(jiao)稀薄的空(kong)(kong)(kong)(kong)(kong)(kong)間。在指定的空(kong)(kong)(kong)(kong)(kong)(kong)間內，低于一個(ge)大氣(qi)壓(ya)力的氣(qi)體(ti)狀態統稱為(wei)真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)。真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)狀態下(xia)氣(qi)體(ti)稀薄程度(du)稱為(wei)真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)（degreeofvacuum），通常(chang)(chang)用壓(ya)力值表示(shi)。因此真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)包裝(zhuang)(zhuang)實際上(shang)不是完(wan)全真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)的，采用真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)包裝(zhuang)(zhuang)技(ji)術包裝(zhuang)(zhuang)的食(shi)品(pin)容器內的真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)度(du)通常(chang)(chang)在600-1333Pa。所以(yi)，又將真(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)(kong)包裝(zhuang)(zhuang)稱為(wei)減壓(ya)包裝(zhuang)(zhuang)或排氣(qi)包裝(zhuang)(zhuang)。