真(zhen)(zhen)空(kong)(kong),這一術語(yu)譯自拉丁(ding)文(wen)vacuo,其(qi)意義(yi)是虛無。其(qi)實真(zhen)(zhen)空(kong)(kong)應理解為氣(qi)體較(jiao)稀薄(bo)的(de)空(kong)(kong)間(jian)。在(zai)指定的(de)空(kong)(kong)間(jian)內,低于一個大(da)氣(qi)壓力的(de)氣(qi)體狀態(tai)統稱為真(zhen)(zhen)空(kong)(kong)。真(zhen)(zhen)空(kong)(kong)狀態(tai)下氣(qi)體稀薄(bo)程度稱為真(zhen)(zhen)空(kong)(kong)度(degreeofvacuum),通常用(yong)壓力值表示(shi)。因(yin)此真(zhen)(zhen)空(kong)(kong)包(bao)裝(zhuang)實際上不(bu)是完全真(zhen)(zhen)空(kong)(kong)的(de),采用(yong)真(zhen)(zhen)空(kong)(kong)包(bao)裝(zhuang)技(ji)術包(bao)裝(zhuang)的(de)食品容器(qi)內的(de)真(zhen)(zhen)空(kong)(kong)度通常在(zai)600-1333Pa。所以,又將(jiang)真(zhen)(zhen)空(kong)(kong)包(bao)裝(zhuang)稱為減壓包(bao)裝(zhuang)或(huo)排氣(qi)包(bao)裝(zhuang)。
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