真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)，這一(yi)術(shu)(shu)語(yu)譯(yi)自拉丁文vacuo，其意義是(shi)虛無。其實(shi)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)應理(li)解為氣(qi)(qi)體較(jiao)稀薄的(de)(de)(de)空(kong)(kong)(kong)(kong)間(jian)。在(zai)指(zhi)定的(de)(de)(de)空(kong)(kong)(kong)(kong)間(jian)內，低于一(yi)個大(da)氣(qi)(qi)壓(ya)力的(de)(de)(de)氣(qi)(qi)體狀態統稱(cheng)(cheng)為真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)。真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)狀態下(xia)氣(qi)(qi)體稀薄程度(du)稱(cheng)(cheng)為真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)度(du)（degreeofvacuum），通常用壓(ya)力值表示。因(yin)此真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)(zhuang)實(shi)際(ji)上不是(shi)完(wan)全真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)的(de)(de)(de)，采(cai)用真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)(zhuang)技術(shu)(shu)包(bao)(bao)裝(zhuang)(zhuang)(zhuang)的(de)(de)(de)食品容器內的(de)(de)(de)真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)度(du)通常在(zai)600-1333Pa。所以，又將真(zhen)(zhen)(zhen)空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)(zhuang)稱(cheng)(cheng)為減(jian)壓(ya)包(bao)(bao)裝(zhuang)(zhuang)(zhuang)或排氣(qi)(qi)包(bao)(bao)裝(zhuang)(zhuang)(zhuang)。