Word: hydrogen
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...President Coolidge by proclamation gave notice that in accordance with the flexible provision of the Tariff Act, in 30 days the import duty on barium dioxide (used in the manufacture of hydrogen peroxide) would be raised from 4? to 6? a pound. The Tariff Commission had reported that Germany was the principal competing country and manufactured barium dioxide more than 6? a pound cheaper than it can be done...
...scientists agree upon an atom which has a very minute, positively charged nucleus, neutralized by a number of negative electrons which surround it. The nucleus has always a definite number of positive charges upon it, varying from one (hydrogen) to 92 (uranium). Outside the nucleus are the negative electrons, varying in number in the same way. The outermost layer of these are the valence electrons, which mingle with those of other atoms in the process of combination. So far as physical science has gone, there have appeared but two fundamental entities, positive and negative electrons?the building stones...
...Richard B. Moore again championed helium as an aeronautic gas. The Dixmude, ZR-2, and Roma disasters would not have occurred, if it had been used, he said. Within a year or two, the cost of production will be practically as cheap as for hydrogen...
...wind is the sole driving, force, but its direction and intensity vary from height to height. The: thing is to keep the craft at that altitude where the wind effects are most: favorable. Suppose a balloon im equilibrium at a certain height. The: sun may come out, heat the hydrogen, contained within the gas, cause it to rise too high. The unskilled pilot: may let out gas in too much of a hurry, drop rapidly, throw out too- much ballast to check his descent, shoot up and lose more gas. "Bobbing up and down," he soon exhausts both...
These examples may give some idea of the range of Professor Bridgman's work, which begins at 3000 atmospheres and goes up to 14,000--the highest ever reached by experiment. At this pressure mercury and hydrogen pass through thick nickel steel as though it were a sieve; and there are six different kinds of ice instead of the one that used to be found in cocktails. At these pressures it was found that white phosphorus when heated to 390 degrees suddenly changed from a colorless, waxy, translucent material to a much denser, jet-black, flaky substance like the graphite...