Word: hydrogenating
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Dates: during 1930-1939
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...transformation, but undergoing no conversion itself. Since chlorophyll is not effective as a catalyst when extracted from the plant, chemists have been unable to study its action. It is composed of two separate pigments, blue-green chlorophyll A and yellow-green chlorophyll B, whose atoms of carbon, hydrogen, and nitrogen are arranged in rings similar to that of the red pigment in human blood corpuscles. Main difference between the chemical composition of chlorophyll and the coloring matter of blood cells is that the former contains magnesium, the latter iron...
...standard table of elements lists 92-from hydrogen, the lightest element, to uranium, the heaviest. An atom of hydrogen has one positive charge on the nucleus and one planetary electron; uranium has a positive nuclear charge of 92, and 92 attendant electrons. The existence of all these elements has been well established, except for Nos. 85 and 87 (alabamine and virginium),† whose discovery has been claimed by various investigators but not yet certainly confirmed. The existence of elements heavier than uranium is theoretically possible. In fact, such heavy elements of higher numbers than 92 are supposed to exist...
Studies of the vastness of the universe and the invisible smallness of the atom are remote from the things of everyday life. Scientists also go far from familiar things in the study of low temperatures. Hydrogen liquefies at 252.7° below zero Centigrade and helium liquefies at - 268.9°. Compared to such temperatures, the inside of an ice-cream freezer is a seething furnace. The utmost cold, absolute zero (zero on the Kelvin scale), comes out at - 273.13° on the arbitrary Centigrade scale (zero for the freezing point of water, 100 for the boiling point). Scientists have not quite...
...long towline, the rafts would float together until help could come. To call for help there was a waterproof, 10-inch square, 15-watt radio transmitter run by dry cells. If these gave out, a waterproof hand generator could be used. The antenna would go aloft tied to a hydrogen-inflated balloon. For the guidance of rescue ships, smaller orange balloons would be blown up, cast on the ocean waves every 15 minutes...
...complete in 1915, and Quantum Mechanics had its fullest flowering in the 19205. Since then, theoretical physics has been bogged down in ever-deepening sinks of paradox and abstraction, while experimental physics has forged gaily ahead, with the discovery of the neutron and positron, of artificial radioactivity, of heavyweight hydrogen...