真(zhen)(zhen)(zhen)空(kong)(kong),這(zhe)一術語譯自拉丁文vacuo,其(qi)意義是(shi)虛無。其(qi)實真(zhen)(zhen)(zhen)空(kong)(kong)應理解為氣(qi)(qi)體(ti)較稀薄的(de)(de)空(kong)(kong)間。在指定的(de)(de)空(kong)(kong)間內(nei),低于一個大氣(qi)(qi)壓(ya)力的(de)(de)氣(qi)(qi)體(ti)狀態統稱(cheng)為真(zhen)(zhen)(zhen)空(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)狀態下氣(qi)(qi)體(ti)稀薄程(cheng)度稱(cheng)為真(zhen)(zhen)(zhen)空(kong)(kong)度(degreeofvacuum),通常用(yong)(yong)壓(ya)力值表示(shi)。因此真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)實際上(shang)不是(shi)完全真(zhen)(zhen)(zhen)空(kong)(kong)的(de)(de),采(cai)用(yong)(yong)真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)技術包(bao)(bao)裝(zhuang)(zhuang)的(de)(de)食品容(rong)器內(nei)的(de)(de)真(zhen)(zhen)(zhen)空(kong)(kong)度通常在600-1333Pa。所(suo)以,又將真(zhen)(zhen)(zhen)空(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)稱(cheng)為減壓(ya)包(bao)(bao)裝(zhuang)(zhuang)或排氣(qi)(qi)包(bao)(bao)裝(zhuang)(zhuang)。
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