真(zhen)(zhen)(zhen)空(kong)(kong),這一術(shu)語(yu)譯自拉丁文vacuo,其意義是虛無。其實真(zhen)(zhen)(zhen)空(kong)(kong)應理解為(wei)氣(qi)(qi)體(ti)較稀薄的(de)空(kong)(kong)間(jian)(jian)。在(zai)指定的(de)空(kong)(kong)間(jian)(jian)內(nei)(nei),低于一個大氣(qi)(qi)壓(ya)力的(de)氣(qi)(qi)體(ti)狀態(tai)(tai)統(tong)稱(cheng)為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)狀態(tai)(tai)下氣(qi)(qi)體(ti)稀薄程度(du)稱(cheng)為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)度(du)(degreeofvacuum),通常用壓(ya)力值表(biao)示(shi)。因此(ci)真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)裝實際(ji)上不是完全真(zhen)(zhen)(zhen)空(kong)(kong)的(de),采用真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)裝技術(shu)包(bao)裝的(de)食品容器(qi)內(nei)(nei)的(de)真(zhen)(zhen)(zhen)空(kong)(kong)度(du)通常在(zai)600-1333Pa。所以,又將真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)裝稱(cheng)為(wei)減壓(ya)包(bao)裝或排氣(qi)(qi)包(bao)裝。
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