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.
CATEGORY: lithics. DEFINITION: A technique used in the manufacture of chipped-stone artifacts in which flakes are produced by striking a core with another stone, a hammerstone, or by striking the core against a fixed stone or anvil in order to dislodge a flake. The method is less precise in its results than indirect percussion.