真(zhen)(zhen)空(kong)(kong)(kong)(kong)，這一術語譯自(zi)拉(la)丁文vacuo，其意(yi)義是虛無。其實(shi)(shi)真(zhen)(zhen)空(kong)(kong)(kong)(kong)應理(li)解為(wei)氣(qi)體較稀薄的空(kong)(kong)(kong)(kong)間(jian)。在(zai)指定(ding)的空(kong)(kong)(kong)(kong)間(jian)內，低于一個大(da)氣(qi)壓力(li)的氣(qi)體狀態(tai)統(tong)稱為(wei)真(zhen)(zhen)空(kong)(kong)(kong)(kong)。真(zhen)(zhen)空(kong)(kong)(kong)(kong)狀態(tai)下(xia)氣(qi)體稀薄程度稱為(wei)真(zhen)(zhen)空(kong)(kong)(kong)(kong)度（degreeofvacuum），通(tong)常用(yong)壓力(li)值表示。因此(ci)真(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)實(shi)(shi)際(ji)上(shang)不是完全真(zhen)(zhen)空(kong)(kong)(kong)(kong)的，采(cai)用(yong)真(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)技(ji)術包(bao)(bao)裝(zhuang)的食(shi)品(pin)容器內的真(zhen)(zhen)空(kong)(kong)(kong)(kong)度通(tong)常在(zai)600-1333Pa。所以，又將(jiang)真(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)稱為(wei)減壓包(bao)(bao)裝(zhuang)或排(pai)氣(qi)包(bao)(bao)裝(zhuang)。