Word: liquidizer
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
Light Molecules. The simplest kind of atomic engine uses a nuclear reactor to heat a gaseous propellant and shoot it out of a nozzle. Its chief advantage over chemical rocket engines: its propellant can be liquid hydrogen, whose molecules are light and therefore move faster at a given temperature. The best possible chemical combination (hydrogen and ozone), burning at 5,000° F. and 500 lbs.-per-sq.-in. chamber pressure, gives an exhaust velocity of 13,000 ft. per sec. A nuclear rocket, using hydrogen at the same pressure and only 3,000° F., shoots...
Since the efficiency of a rocket engine depends largely on its exhaust velocity, the nuclear engine has a big initial advantage, but it has to pay a high price. The engine itself, which must be cooled elaborately by the liquid hydrogen, will be about as complicated as a conventional chemical engine (see diagram). Its controls will be even more complicated, and all its delicate parts will have to perform perfectly in spite of intense gamma rays striking through them at takeoff...
...feet in diameter, but it will have to generate something like 100 times the energy of the massive reactor of Britain's Calder Hall nuclear power station. This means that it will run very hot, and will be kept from flashing into vapor only by the stream of liquid hydrogen forced rapidly through it. On the other hand, the core need work for only a few minutes. By that time the propellant will have been exhausted, and the rocket will be on its way into deep space...
...their own laboratories with molds as unnatural as the most monstrous fruit flies. The coral fluffs of normal Neurospora are rare in the test tubes and Petri dishes. In their place are blackish warts, lichenlike incrustations, or sick-looking globules. One horrible kind of mold grown in a moving liquid floats in bunches with limp limbs like soft, dead crabs...
...improvement showed up in the West, the Southwest and the Rocky Mountain region; truckers in the Midwest, the South and along the Atlantic Coast were still in trouble. Building materials hauled were up 12.2% for the first quarter above last year, reflecting the rise in construction, and shipments of liquid petroleum, household goods and refrigerated liquids and solids were also...