氨氣的熔點是:-77.75℃,很容易被液化成無色的液體,會分解成氮氣和氫氣,也容易被固化成雪狀固體,是一種無色氣體。氨氣的密度為:0.7710,H?SO? +2NH? = (NH?)?SO? ,加壓就可以使其液化。氨氣和硫酸反應氨氣和硫酸的反應,(3)當氨氣與硫酸摩爾比1:1與2:1之間時:2H?SO? +3NH? = (NH?)?SO? +NH?HSO?,(1)當氨氣與硫酸摩爾比≤1:1時:H?SO? + NH? = NH?HSO?,