真(zhen)(zhen)(zhen)空(kong)(kong),這(zhe)一術語譯自拉丁文vacuo,其意義是(shi)虛無。其實真(zhen)(zhen)(zhen)空(kong)(kong)應理解為(wei)氣體較稀薄(bo)的(de)空(kong)(kong)間。在(zai)指定的(de)空(kong)(kong)間內,低于一個大氣壓(ya)(ya)力(li)的(de)氣體狀(zhuang)態(tai)統稱為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)狀(zhuang)態(tai)下氣體稀薄(bo)程度(du)稱為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)度(du)(degreeofvacuum),通(tong)常用(yong)壓(ya)(ya)力(li)值(zhi)表示。因此真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)裝實際上不是(shi)完(wan)全(quan)真(zhen)(zhen)(zhen)空(kong)(kong)的(de),采用(yong)真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)裝技術包(bao)裝的(de)食品容器(qi)內的(de)真(zhen)(zhen)(zhen)空(kong)(kong)度(du)通(tong)常在(zai)600-1333Pa。所以,又將真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)裝稱為(wei)減壓(ya)(ya)包(bao)裝或(huo)排氣包(bao)裝。
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