真(zhen)空(kong)(kong),這(zhe)一(yi)術語譯(yi)自拉(la)丁文vacuo,其(qi)意義(yi)是虛無。其(qi)實真(zhen)空(kong)(kong)應(ying)理解(jie)為(wei)(wei)氣(qi)體較稀薄的(de)(de)(de)空(kong)(kong)間。在(zai)指定的(de)(de)(de)空(kong)(kong)間內,低(di)于一(yi)個大氣(qi)壓力(li)的(de)(de)(de)氣(qi)體狀(zhuang)態統稱為(wei)(wei)真(zhen)空(kong)(kong)。真(zhen)空(kong)(kong)狀(zhuang)態下氣(qi)體稀薄程度(du)稱為(wei)(wei)真(zhen)空(kong)(kong)度(du)(degreeofvacuum),通常用(yong)壓力(li)值表示(shi)。因此真(zhen)空(kong)(kong)包(bao)(bao)裝實際上不(bu)是完全(quan)真(zhen)空(kong)(kong)的(de)(de)(de),采用(yong)真(zhen)空(kong)(kong)包(bao)(bao)裝技術包(bao)(bao)裝的(de)(de)(de)食(shi)品容器(qi)內的(de)(de)(de)真(zhen)空(kong)(kong)度(du)通常在(zai)600-1333Pa。所以,又將真(zhen)空(kong)(kong)包(bao)(bao)裝稱為(wei)(wei)減壓包(bao)(bao)裝或排氣(qi)包(bao)(bao)裝。
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