真(zhen)(zhen)(zhen)空(kong)(kong),這一術(shu)語譯自拉丁文vacuo,其意義(yi)是虛無(wu)。其實(shi)真(zhen)(zhen)(zhen)空(kong)(kong)應(ying)理解為氣體(ti)較稀薄的(de)空(kong)(kong)間(jian)。在指定的(de)空(kong)(kong)間(jian)內(nei),低于一個大氣壓(ya)力的(de)氣體(ti)狀態統稱為真(zhen)(zhen)(zhen)空(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)狀態下氣體(ti)稀薄程度(du)(du)稱為真(zhen)(zhen)(zhen)空(kong)(kong)度(du)(du)(degreeofvacuum),通常用壓(ya)力值表(biao)示。因此真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)(bao)裝(zhuang)實(shi)際上不(bu)是完全真(zhen)(zhen)(zhen)空(kong)(kong)的(de),采(cai)用真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)(bao)裝(zhuang)技術(shu)包(bao)(bao)裝(zhuang)的(de)食品容器(qi)內(nei)的(de)真(zhen)(zhen)(zhen)空(kong)(kong)度(du)(du)通常在600-1333Pa。所(suo)以(yi),又(you)將真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)(bao)裝(zhuang)稱為減壓(ya)包(bao)(bao)裝(zhuang)或排氣包(bao)(bao)裝(zhuang)。
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