真(zhen)空(kong)(kong)(kong),這一術語譯自拉丁(ding)文vacuo,其意義是虛無。其實真(zhen)空(kong)(kong)(kong)應(ying)理解為氣(qi)體(ti)較稀薄的(de)空(kong)(kong)(kong)間(jian)。在(zai)指定的(de)空(kong)(kong)(kong)間(jian)內,低于一個大氣(qi)壓(ya)(ya)力(li)的(de)氣(qi)體(ti)狀(zhuang)態統稱為真(zhen)空(kong)(kong)(kong)。真(zhen)空(kong)(kong)(kong)狀(zhuang)態下(xia)氣(qi)體(ti)稀薄程(cheng)度稱為真(zhen)空(kong)(kong)(kong)度(degreeofvacuum),通常用壓(ya)(ya)力(li)值(zhi)表(biao)示。因此真(zhen)空(kong)(kong)(kong)包(bao)(bao)(bao)裝(zhuang)實際(ji)上不是完全真(zhen)空(kong)(kong)(kong)的(de),采用真(zhen)空(kong)(kong)(kong)包(bao)(bao)(bao)裝(zhuang)技術包(bao)(bao)(bao)裝(zhuang)的(de)食品容(rong)器內的(de)真(zhen)空(kong)(kong)(kong)度通常在(zai)600-1333Pa。所以,又將真(zhen)空(kong)(kong)(kong)包(bao)(bao)(bao)裝(zhuang)稱為減壓(ya)(ya)包(bao)(bao)(bao)裝(zhuang)或排(pai)氣(qi)包(bao)(bao)(bao)裝(zhuang)。
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