真(zhen)(zhen)空(kong)(kong),這(zhe)一術(shu)語譯自拉(la)丁文vacuo,其意義是虛無。其實真(zhen)(zhen)空(kong)(kong)應理解(jie)為氣(qi)(qi)體(ti)較稀薄(bo)的(de)(de)空(kong)(kong)間。在指定的(de)(de)空(kong)(kong)間內(nei),低于(yu)一個大氣(qi)(qi)壓力的(de)(de)氣(qi)(qi)體(ti)狀態(tai)統稱為真(zhen)(zhen)空(kong)(kong)。真(zhen)(zhen)空(kong)(kong)狀態(tai)下氣(qi)(qi)體(ti)稀薄(bo)程(cheng)度(du)稱為真(zhen)(zhen)空(kong)(kong)度(du)(degreeofvacuum),通常用壓力值表示。因此真(zhen)(zhen)空(kong)(kong)包(bao)裝實際上不是完全真(zhen)(zhen)空(kong)(kong)的(de)(de),采用真(zhen)(zhen)空(kong)(kong)包(bao)裝技術(shu)包(bao)裝的(de)(de)食品容器內(nei)的(de)(de)真(zhen)(zhen)空(kong)(kong)度(du)通常在600-1333Pa。所以,又將真(zhen)(zhen)空(kong)(kong)包(bao)裝稱為減(jian)壓包(bao)裝或排氣(qi)(qi)包(bao)裝。
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