真(zhen)(zhen)(zhen)空(kong)(kong)(kong)，這一(yi)術語(yu)譯自拉丁文vacuo，其(qi)意義是虛無。其(qi)實(shi)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)應理解為(wei)(wei)(wei)氣體較稀薄的(de)(de)(de)(de)空(kong)(kong)(kong)間。在(zai)指定的(de)(de)(de)(de)空(kong)(kong)(kong)間內，低于一(yi)個大氣壓(ya)(ya)力(li)的(de)(de)(de)(de)氣體狀態(tai)統(tong)稱為(wei)(wei)(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)(kong)狀態(tai)下氣體稀薄程度稱為(wei)(wei)(wei)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)度（degreeofvacuum），通常(chang)用(yong)(yong)壓(ya)(ya)力(li)值(zhi)表示。因此(ci)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)實(shi)際(ji)上(shang)不是完全真(zhen)(zhen)(zhen)空(kong)(kong)(kong)的(de)(de)(de)(de)，采用(yong)(yong)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)技術包(bao)裝(zhuang)(zhuang)的(de)(de)(de)(de)食(shi)品容器內的(de)(de)(de)(de)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)度通常(chang)在(zai)600-1333Pa。所以，又(you)將真(zhen)(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)(zhuang)稱為(wei)(wei)(wei)減壓(ya)(ya)包(bao)裝(zhuang)(zhuang)或排氣包(bao)裝(zhuang)(zhuang)。