不,惰性氣體不止第18族元素,你去查一下inert gas的定義就知道。
通常只有noble gas會專指18族,如果用inert就廣泛的指某些條件下
為惰性的惰性氣體。但在中文翻譯中noble跟inert gas都被翻譯成惰性氣體。
可以參考下國家教育研究院的學術名詞。

http://goo.gl/Rux7k

順便提供一下,甚至甲烷等烷類也是惰性氣體,他本身只有sigma單鍵,一般化學
條件下不容易反應,所以不要以為天然氣容易爆炸就以為他不惰性。氧氣相比起
來活潑多了。至於氮氣的問題就在於不可以讓空氣的含氧量低於18%,否則很容
易就會昏厥尤其在泳池裡很容易就溺斃了。倒不是他會產生甚麼化學反應

記者寫的那些就更豪誵了,隨便google N2跟HOCl就要起反應了嗎=.=

Free chlorine readily reacts with Ammonia and other ammoniated compounds to form what are known as “chloramines”. These chloramines are known as monochloramine, dichloramine, and trichloramine. Chloramines are also referred to, in the industry, as combined chlorine. While chloramines do have some bactericidal properties, they are 80 to 100 times less effective than free chlorine. The rate of formation of chloramines is dependent on the ratio of free chlorine concentration to ammonia concentration. Optimum pH, temperature, and mixing conditions are also a factor.

When chlorine is added to water containing ammonia (NH3), chlorine will replace one hydrogen ion on the ammonia molecule with a chloride ion, resulting in the formation of monochloramine:

HOCl + NH3 → NH2Cl (Monochloramine) + H2O

If the free chlorine to ammonia ratio is allowed to fall below 5:1 by weight (either by chlorine loss or by the addition of ammonia to the sample), all free chlorine will be converted to monochloramine. Between the pH range of 7-8, this reactions takes place almost instantaneously.

If the chlorine to ammonia ratio is increased back above 5:1, the additional chlorine will displace a second hydrogen ion from the monochloramine molecule and replace it with another chloride ion, resulting in the formation of dichloramine:

HOCl + NH2Cl → NHCl2 (Dichloramine) + H2O

Dichloramines are notorious for their bad smell, and are usually the prime suspects for “chlorine smell” and eye irritation in the pool and spa industry.

The third member of the chloramines group, trichloramine, is similarly formed. Additional chlorine reacts with dichloramine to form the tri-substituted trichloramine (commonly referred to as Nitrogen trichloride):

HOCl + NHCl2 → NCl3 (Trichloramine) + H2O

(Trichloramine is both volatile and unstable and is usually not allowed to form in most industries).

At this point, if enough chlorine is added to bring the chlorine to ammonia ratio up to 10:1, the mono- and dichloramines are almost completely destroyed and converted back into less offensive nitrogen compounds and chloride salts:

2 NHCl2 + 2 HOCl → N2 + 6 Cl- + 2 H2O

這跟氮氣與次氯酸反應根本天差地遠

最後其實也不用擔心凍死,因為液氮的比熱跟蒸發熱都非常低
他倒四桶,假設一桶25公升,液態氮的比重為0.8g/mL
所以總重為100Lx0.8kg/L=80kg

把80公斤零下196度C的LN2變成24度(假設泳池溫度)的氮氣所需的熱量
a.轉換成氮氣80kg x 200KJ/kg(蒸發潛熱)=16000kJ
b.-196C的氮氣提升到24C 80kg x 1kJ/kgC(氮氣比熱) x 220C=17600kJ
總共33600kJ,這能量可以把泳池降低幾度呢?

假設泳池50m x 20m x 1m=10^6公升
3.36x10^7=4.2(熱卡當量)x 10^6kg x 1000 cal/kgC x T
T=8x10^-3(降低千分之8度)

以上是簡略的估計

當然你直接待在倒入口下方肯定會凍傷,但考慮到氣體液體的熱傳導慢,只要稍微遠離
根本不用擔心溫度問題。