真(zhen)(zhen)(zhen)空(kong)(kong),這一術(shu)語譯自拉丁文(wen)vacuo,其(qi)意義是虛(xu)無。其(qi)實真(zhen)(zhen)(zhen)空(kong)(kong)應(ying)理解為(wei)氣(qi)體(ti)(ti)較稀(xi)薄的空(kong)(kong)間(jian)。在指定的空(kong)(kong)間(jian)內,低于(yu)一個大氣(qi)壓(ya)力的氣(qi)體(ti)(ti)狀(zhuang)態統稱(cheng)為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)狀(zhuang)態下氣(qi)體(ti)(ti)稀(xi)薄程度(du)稱(cheng)為(wei)真(zhen)(zhen)(zhen)空(kong)(kong)度(du)(degreeofvacuum),通常用(yong)壓(ya)力值表示。因此真(zhen)(zhen)(zhen)空(kong)(kong)包裝(zhuang)實際(ji)上(shang)不是完全(quan)真(zhen)(zhen)(zhen)空(kong)(kong)的,采用(yong)真(zhen)(zhen)(zhen)空(kong)(kong)包裝(zhuang)技術(shu)包裝(zhuang)的食品(pin)容器內的真(zhen)(zhen)(zhen)空(kong)(kong)度(du)通常在600-1333Pa。所以,又將真(zhen)(zhen)(zhen)空(kong)(kong)包裝(zhuang)稱(cheng)為(wei)減(jian)壓(ya)包裝(zhuang)或排氣(qi)包裝(zhuang)。
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