真(zhen)空(kong)(kong)(kong)，這一術(shu)語(yu)譯自拉丁文(wen)vacuo，其(qi)意義是虛無。其(qi)實真(zhen)空(kong)(kong)(kong)應理解為氣(qi)體較稀薄(bo)的空(kong)(kong)(kong)間(jian)。在指定(ding)的空(kong)(kong)(kong)間(jian)內(nei)，低于一個(ge)大氣(qi)壓力(li)的氣(qi)體狀態統稱為真(zhen)空(kong)(kong)(kong)。真(zhen)空(kong)(kong)(kong)狀態下氣(qi)體稀薄(bo)程度(du)(du)稱為真(zhen)空(kong)(kong)(kong)度(du)(du)（degreeofvacuum），通常用壓力(li)值表(biao)示。因此真(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)實際上不是完全真(zhen)空(kong)(kong)(kong)的，采用真(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)技術(shu)包(bao)裝(zhuang)的食品容器(qi)內(nei)的真(zhen)空(kong)(kong)(kong)度(du)(du)通常在600-1333Pa。所以，又將(jiang)真(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)稱為減壓包(bao)裝(zhuang)或排(pai)氣(qi)包(bao)裝(zhuang)。