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首先，因為氦氣的外層的電子是2，而且氦只有一層電子，層電子是2，這意味著達到了穩定結構，所以氦氣的化學性質相對來說比較穩定，不易發生反應、爆炸等。在一些比較值錢的設備：例如飛機、宇宙飛船等都喜歡用氦氣作為檢漏用氣。但氦氣在自然界的儲量少，價錢也比較昂貴，所以為了節約成本，一些企業也就選擇氫和氮的混合氣體作為檢漏用氣，或者直接用氮氣作為檢漏用氣。

氦氣(qi)在在半導體中的檢漏作(zuo)用

為(wei)(wei)了防止半導(dao)體器(qi)件(jian)、集成電路等(deng)元器(qi)件(jian)的(de)(de)(de)(de)表(biao)面因玷污水汽等(deng)雜質而導(dao)致性能(neng)退化，就必(bi)須采用管(guan)(guan)(guan)(guan)殼(ke)(ke)來密封(feng)。但是在管(guan)(guan)(guan)(guan)殼(ke)(ke)的(de)(de)(de)(de)封(feng)接(jie)處或者引線接(jie)頭處往往會因為(wei)(wei)各種原(yuan)因而產生一(yi)些(xie)肉眼難以發現的(de)(de)(de)(de)小(xiao)(xiao)(xiao)洞(dong)(dong)，所(suo)以在元器(qi)件(jian)封(feng)裝(zhuang)之后，就需(xu)要采取某些(xie)方(fang)法來檢(jian)(jian)(jian)(jian)(jian)測這些(xie)小(xiao)(xiao)(xiao)洞(dong)(dong)的(de)(de)(de)(de)存在與(yu)否。氦(hai)(hai)氣(qi)(qi)(qi)檢(jian)(jian)(jian)(jian)(jian)漏就是采用氦(hai)(hai)氣(qi)(qi)(qi)來檢(jian)(jian)(jian)(jian)(jian)查(cha)電子元器(qi)件(jian)封(feng)裝(zhuang)管(guan)(guan)(guan)(guan)殼(ke)(ke)上的(de)(de)(de)(de)小(xiao)(xiao)(xiao)漏洞(dong)(dong)。因為(wei)(wei)氦(hai)(hai)原(yuan)子的(de)(de)(de)(de)尺寸(cun)很(hen)小(xiao)(xiao)(xiao)，容易穿過(guo)小(xiao)(xiao)(xiao)洞(dong)(dong)而進(jin)(jin)入到(dao)管(guan)(guan)(guan)(guan)殼(ke)(ke)內部(bu)，所(suo)以這種檢(jian)(jian)(jian)(jian)(jian)測方(fang)法能(neng)夠檢(jian)(jian)(jian)(jian)(jian)測出(chu)尺寸(cun)很(hen)小(xiao)(xiao)(xiao)的(de)(de)(de)(de)小(xiao)(xiao)(xiao)洞(dong)(dong)（即能(neng)夠檢(jian)(jian)(jian)(jian)(jian)測出(chu)漏氣(qi)(qi)(qi)速(su)率約為(wei)(wei)10?11～10?12cm3/sec的(de)(de)(de)(de)小(xiao)(xiao)(xiao)洞(dong)(dong)），靈敏度可與(yu)放(fang)射(she)性檢(jian)(jian)(jian)(jian)(jian)漏方(fang)法匹(pi)敵，但要比放(fang)射(she)性檢(jian)(jian)(jian)(jian)(jian)漏方(fang)法簡便(bian)。氦(hai)(hai)氣(qi)(qi)(qi)檢(jian)(jian)(jian)(jian)(jian)漏試驗(yan)的(de)(de)(de)(de)方(fang)法：首先把(ba)封(feng)裝(zhuang)好的(de)(de)(de)(de)元器(qi)件(jian)放(fang)入充滿(man)氦(hai)(hai)氣(qi)(qi)(qi)的(de)(de)(de)(de)容器(qi)中(zhong)，并加(jia)壓，讓氦(hai)(hai)氣(qi)(qi)(qi)通過(guo)小(xiao)(xiao)(xiao)洞(dong)(dong)而進(jin)(jin)入管(guan)(guan)(guan)(guan)殼(ke)(ke)中(zhong)；然后取出(chu)，并用壓縮空氣(qi)(qi)(qi)吹去管(guan)(guan)(guan)(guan)殼(ke)(ke)表(biao)面的(de)(de)(de)(de)殘留氦(hai)(hai)氣(qi)(qi)(qi)；接(jie)著采用質譜(pu)儀來檢(jian)(jian)(jian)(jian)(jian)測管(guan)(guan)(guan)(guan)殼(ke)(ke)外表(biao)所(suo)漏出(chu)的(de)(de)(de)(de)氦(hai)(hai)氣(qi)(qi)(qi)。