Nitric acid (HNO3) is an extremely important chemical used in the manufacture of fertilisers and explosives. It is made from ammonia by the Ostwald Process (developed in 1902 by the German chemist Wilhelm Ostwald, who got the Nobel prize in 1909).
2. ethics (used with a sing. verb) The study of the general nature of morals and of the specific moral choices to be made by a person; moral philosophy. 3. ethics (used with a sing. or pl. verb) The rules or standards governing the conduct of a person or the members of a profession: medical ethics.
Ethos is a term with Greek origins, and it refers to the morals, values and beliefs of a person, or even an entire culture. Ethos is also one of the three rhetorical appeals identified by Aristotle. The other two appeals are logos (logic) and pathos (emotion).