真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)，這(zhe)一術(shu)語譯自拉丁文vacuo，其意義(yi)是虛無。其實(shi)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)應理(li)解為(wei)(wei)氣體(ti)較(jiao)稀薄的(de)(de)空(kong)(kong)(kong)(kong)(kong)間。在指定的(de)(de)空(kong)(kong)(kong)(kong)(kong)間內，低于(yu)一個大氣壓(ya)力的(de)(de)氣體(ti)狀(zhuang)態(tai)統稱(cheng)為(wei)(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)狀(zhuang)態(tai)下氣體(ti)稀薄程度稱(cheng)為(wei)(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)度（degreeofvacuum），通常(chang)用壓(ya)力值表示。因(yin)此真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)包裝實(shi)際(ji)上不(bu)是完全真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)的(de)(de)，采(cai)用真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)包裝技(ji)術(shu)包裝的(de)(de)食(shi)品容(rong)器內的(de)(de)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)度通常(chang)在600-1333Pa。所(suo)以，又(you)將真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)(kong)包裝稱(cheng)為(wei)(wei)減(jian)壓(ya)包裝或排氣包裝。