The best (and best-known) Pulaski Day tribute comes from one-time Chicagoan Sufjan Stevens. On his album Illinois, Stevens used âCasimir Pulaski Dayâ to remember both the holiday and his friend, whoâd been battling bone cancer.
Definition of ammonia for Students. 1 : a colorless gas that is a compound of nitrogen and hydrogen, has a sharp smell and taste, can be easily made liquid by cold and pressure, and is used in cleaning products and in making fertilizers and explosives. 2 : a solution of ammonia and water.
Ammonia is manufactured by combining nitrogen and hydrogen directly. Nitrogen and hydrogen are compressed to about 250 atmospheres and heated to about 4000 centigrade. They are then passed over an iron catalyst to form ammonia. The reaction is reversible, and unchanged nitrogen and hydrogen are recycled.