Word: nitric
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Dates: during 1930-1939
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Tungsten is one of the hardest metals. Its melting point is high, 2,974° C. It is more lustrous than silver, nickel or chromium. Most important commercially is its resistance to corrosives. Only nitric acid and hot hydroxide solutions affect tungsten. Factories dealing with chemicals need just such a resistant to coat their pipes and pots...
...General Chemical Division makes sulphuric acid, nitric acid, hydrochloric acid, acetic acid and related products. The business of this division is steady, does not promise great expansion, must be considered a valuable backlog...
...phrase, "micro-sticks and micro-stones," the U. S. Weather Bureau's William Jackson Humphreys coined to emphasize how technically impure is the air man breathes. Always in the atmosphere are bits of rock, vegetable fibre, litter, salt (over oceans), sulphuric acid (from soft coal chimneys and volcanoes), nitric acid (from lightning), meteoritic ash. The bronchial tubes get rid of most of such debris with almost no harm to the body...