Tiring of field and flock, in 1768 he moved to Edinburgh, where he founded a successful business producing sal ammoniac from coal soot, and busied himself with various scientific pursuits.

1768年，他对土地和羊群感厌，了爱丁堡。他建立了一家很成功的企业，用煤烟生产氯化铵，同时忙于各种科学研究。

Because ammonium chloride is a solid at room temperature, it forms a superfine white powder where the two gases meet in the tube.

由于氯化铵室温下固体，因此当两种气体试管中相遇时，会形成一层超细的白色粉末。

This is barium hydroxide octahydrate and this is ammonium chloride.

八水氢氧化， 氯化铵。

That's the ammonium chloride powder forming.

那氯化铵粉末形成的过程。

Because the ammonium chloride is a solid at room temperature, it forms a superfine white powder where the two gases meet in the tubes, so we'll be able to tell exactly how far each gas traveled before they met.

因为氯化铵室温下固体，所以当两种气体管中相遇时， 会形成极细的白色粉末， 样我们就能准确地知道每种气体相遇前走了多远。

Fun fact: ammonia and hydrochloric acid react together readily to form a solid -- ammonium chloride.

趣味知识：氨和盐酸很容易反应生成固体——氯化铵。

For example, ammonia acts as a base when it reacts with hydrochloric acid to form ammonium chloride.

例如，氨与盐酸反应生成氯化铵时充当碱。