真(zhen)(zhen)(zhen)空(kong)(kong)(kong)，這一(yi)術語(yu)譯自拉丁(ding)文(wen)vacuo，其(qi)意義是(shi)虛無。其(qi)實真(zhen)(zhen)(zhen)空(kong)(kong)(kong)應理解為氣(qi)體較稀(xi)(xi)薄(bo)的(de)(de)(de)空(kong)(kong)(kong)間(jian)。在(zai)指定的(de)(de)(de)空(kong)(kong)(kong)間(jian)內(nei)，低于一(yi)個大氣(qi)壓(ya)(ya)力(li)的(de)(de)(de)氣(qi)體狀態統稱為真(zhen)(zhen)(zhen)空(kong)(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)(kong)狀態下氣(qi)體稀(xi)(xi)薄(bo)程度(du)稱為真(zhen)(zhen)(zhen)空(kong)(kong)(kong)度(du)（degreeofvacuum），通常用(yong)壓(ya)(ya)力(li)值表示。因此真(zhen)(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)實際上不是(shi)完全真(zhen)(zhen)(zhen)空(kong)(kong)(kong)的(de)(de)(de)，采用(yong)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)技術包(bao)裝(zhuang)的(de)(de)(de)食(shi)品容器內(nei)的(de)(de)(de)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)度(du)通常在(zai)600-1333Pa。所以(yi)，又將(jiang)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)稱為減壓(ya)(ya)包(bao)裝(zhuang)或排(pai)氣(qi)包(bao)裝(zhuang)。