人類活動的周圍，充滿著空氣
，雖然空氣無色、無味
，人眼看不見摸不著，實際上地球周圍的這個空間並不是空的，空氣並非是“虛無”的de東dong西xi，它ta和he一yi切qie物wu體ti一yi樣yang，占zhan有you空kong間jian
，也ye有you重zhong量liang。同tong時shi它ta不bu是shi單dan一yi的de物wu質zhi
，而er是shi由you各ge種zhong氣qi體ti組zu成cheng的de混hun合he物wu。這zhe人ren類lei生sheng存cun的de環huan境jing被bei稱cheng為wei大da氣qi，具ju有you的de壓ya力li稱cheng為wei大da氣qi壓ya力li。大da氣qi壓ya力li因yin海hai拔ba高gao度du及ji氣qi象xiang條tiao件jian等deng的de不bu同tong具ju有you不bu同tong的de數shu值zhi。所suo謂wei“真空”，是shi指zhi壓ya力li比bi大da氣qi壓ya力li低di的de空kong間jian狀zhuang態tai，即ji在zai給gei定ding的de空kong間jian內nei，低di於yu大da氣qi壓ya力li的de氣qi體ti狀zhuang態tai。在zai真zhen空kong空kong間jian中zhong還hai包bao含han有you氣qi態tai分fen子zi，隻zhi是shi比bi大da氣qi壓ya下xia的de氣qi態tai分fen子zi數shu要yao少shao。真zhen空kong隻zhi是shi相xiang對dui於yu大da氣qi壓ya而er存cun在zai，完wan全quan沒mei有you任ren何he物wu質zhi的de“絕對真空”，是永遠也不可能存在的。 

 

 

2．什麼是真空度? 

 

 

真空度是指空間所具有的氣體壓力與當時大氣壓力的差值。一般說“真空度高”、“真空度好”是指壓強低，反之“真空度低”
、“真空壞”、“真空抽不上”是指壓強高。 

 

 

3．何謂“真空泵”? 

 

 

凡是能獲得真空的設備，統稱為真空泵。如水流泵
、旋片泵、滑閥泵、羅茨泵、油增壓泵、擴散泵、分子泵
、離子吸氣泵、升華泵
、低溫泵等都屬於真空泵。 

 

4．什麼是極限壓強? 

 

 

jixianyaqiangyouchengjixianzhenkong
，shizhizaizhenkonghuodeshebeizhongnenghuodedezuigaozhenkongdu，jizuidiyaqiang。geleizhenkongbengyouyubenshenjiegouneizaiyuanyin，suonenghuodedezhenkongdouyouyidingdexiandu。jixiezhenkongbengyoudejixianyaqiangceding

，guidingbixuxuanyongshuangjiyoujizhenkongbengzuoweishiyanyongbeng，fouzeyouyubengbenshenjiudabudaoyoupinzhibiaoguidingdejixianyaqiang
，duiyoupinceshijieguohuiyouyingxiang。yourukuosanbengyoujixianyaqiangceshiyongdesanjiboliyoukuosanbeng
，yejingguoyangedeshiyanxuanzehoubeiyong。 

 

 

5．何謂飽和蒸氣壓? 

 

任ren何he液ye體ti在zai氣qi化hua時shi
，液ye體ti分fen子zi必bi須xu克ke服fu液ye體ti分fen子zi對dui它ta的de引yin力li，才cai能neng脫tuo離li液ye體ti表biao麵mian飛fei到dao周zhou圍wei的de空kong間jian，這zhe種zhong現xian象xiang稱cheng為wei蒸zheng發fa。相xiang反fan地di氣qi體ti轉zhuan化hua為wei液ye體ti時shi

，稱cheng為wei凝ning結jie。 

 

 

zaiyidingwenduxiazaiyimibidekongjianzhong
，ruguoyetizhengfashikongjianchongmanyidingmiduhuoyalidezhengqihou
，yetibuzaizhengfajianshao
，zheshiyetihezhengqiliangxiangdadaolexiangpingheng。zhezhongpinghengzhibuguoshibuduandezhengfayundonghebuduandeningjieyundongdadaotongdengchengdu。ruzaiyihengwendemibirongqizhong，rongqineideyetijiangzidongzhengfaqihua，yizhidaozhengqideyalidadaomouyizhihouyexiangbuzaijianshao
，qiyabuzaizengjia
，jidadaoxiangdepingheng。cishidezhengqiyali，jiuchengweigaiwuzhizaizheyiwenduxiadebaohezhengqiya。