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.
the body of moral principles or values governing or distinctive of a particular culture or group: the Christian ethic; the tribal ethic of the Zuni. 2. a complex of moral precepts held or rules of conduct followed by an individual: a personal ethic. Origin of ethic.