真(zhen)(zhen)(zhen)空(kong)(kong),這(zhe)一(yi)術語(yu)譯自拉丁文(wen)vacuo,其意義是虛無(wu)。其實(shi)真(zhen)(zhen)(zhen)空(kong)(kong)應理解為(wei)氣(qi)體(ti)較稀(xi)薄(bo)的空(kong)(kong)間。在指(zhi)定的空(kong)(kong)間內(nei),低于(yu)一(yi)個大氣(qi)壓(ya)力的氣(qi)體(ti)狀態統(tong)稱(cheng)(cheng)(cheng)為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)狀態下氣(qi)體(ti)稀(xi)薄(bo)程度稱(cheng)(cheng)(cheng)為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)度(degreeofvacuum),通常用壓(ya)力值表示。因此真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)裝(zhuang)(zhuang)實(shi)際上不是完全真(zhen)(zhen)(zhen)空(kong)(kong)的,采用真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)裝(zhuang)(zhuang)技(ji)術包(bao)裝(zhuang)(zhuang)的食(shi)品容器內(nei)的真(zhen)(zhen)(zhen)空(kong)(kong)度通常在600-1333Pa。所以,又將真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)裝(zhuang)(zhuang)稱(cheng)(cheng)(cheng)為(wei)減壓(ya)包(bao)裝(zhuang)(zhuang)或排氣(qi)包(bao)裝(zhuang)(zhuang)。
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