真(zhen)(zhen)空(kong)(kong),這(zhe)一術語譯自(zi)拉丁文(wen)vacuo,其意義是虛無。其實真(zhen)(zhen)空(kong)(kong)應理解(jie)為(wei)(wei)(wei)氣體較稀薄的(de)(de)空(kong)(kong)間。在指定的(de)(de)空(kong)(kong)間內,低于一個大氣壓力的(de)(de)氣體狀(zhuang)態(tai)統稱為(wei)(wei)(wei)真(zhen)(zhen)空(kong)(kong)。真(zhen)(zhen)空(kong)(kong)狀(zhuang)態(tai)下氣體稀薄程度稱為(wei)(wei)(wei)真(zhen)(zhen)空(kong)(kong)度(degreeofvacuum),通常(chang)用(yong)壓力值(zhi)表示。因此(ci)真(zhen)(zhen)空(kong)(kong)包(bao)(bao)(bao)裝實際上不是完全真(zhen)(zhen)空(kong)(kong)的(de)(de),采用(yong)真(zhen)(zhen)空(kong)(kong)包(bao)(bao)(bao)裝技術包(bao)(bao)(bao)裝的(de)(de)食品容器內的(de)(de)真(zhen)(zhen)空(kong)(kong)度通常(chang)在600-1333Pa。所以,又(you)將(jiang)真(zhen)(zhen)空(kong)(kong)包(bao)(bao)(bao)裝稱為(wei)(wei)(wei)減壓包(bao)(bao)(bao)裝或排氣包(bao)(bao)(bao)裝。
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