真(zhen)(zhen)空(kong)(kong)(kong)，這一術(shu)語譯(yi)自(zi)拉丁文(wen)vacuo，其(qi)意義是(shi)虛無。其(qi)實真(zhen)(zhen)空(kong)(kong)(kong)應理解為(wei)氣體較稀(xi)薄的(de)(de)(de)空(kong)(kong)(kong)間(jian)。在指定的(de)(de)(de)空(kong)(kong)(kong)間(jian)內，低(di)于一個大氣壓力的(de)(de)(de)氣體狀態統稱為(wei)真(zhen)(zhen)空(kong)(kong)(kong)。真(zhen)(zhen)空(kong)(kong)(kong)狀態下氣體稀(xi)薄程度稱為(wei)真(zhen)(zhen)空(kong)(kong)(kong)度（degreeofvacuum），通(tong)常用壓力值表示。因此真(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)實際上不是(shi)完全真(zhen)(zhen)空(kong)(kong)(kong)的(de)(de)(de)，采用真(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)技術(shu)包(bao)裝(zhuang)的(de)(de)(de)食品容器內的(de)(de)(de)真(zhen)(zhen)空(kong)(kong)(kong)度通(tong)常在600-1333Pa。所以，又將真(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)稱為(wei)減壓包(bao)裝(zhuang)或排氣包(bao)裝(zhuang)。