Word: vapor
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...inexhaustible. Not all solar power comes directly from the sun: both wind and hydroelectric power are solar, since wind is created by the sun's uneven warming of the atmosphere and since the water / that collects behind dams was originally rain, which in turn was water vapor evaporated by solar heating...
...already implemented or proposed initiatives to reduce smog in American cities, going back as far as the Clean Air Act 17 years ago. In the mid-1970s, catalytic converters on automobiles became mandatory. The Environmental Protection Agency has further advocated the use of methanol-based gasoline consumption and vapor recovery systems on cars and filling station pumps...
...part to answer such questions that the U.S. Viking 1 and 2 spacecraft, each consisting of an orbiter and a lander, were dispatched to Mars. When they arrived, 45 days apart, in 1976, cameras aboard the orbiters snapped away and remote-sensing devices searched for water vapor in the thin atmosphere and sought out frozen water in the polar ice caps. On the surface, the landers began providing the most accurate measurements yet of Martian surface temperatures, atmospheric density and wind velocity, while the cameras shot more than 4,500 spectacular close-up pictures of the surrounding, rock- strewn landscape...
...speculation among scientists on earth. Did the oxygen come from some tiny form of Martian life in the soil? After further tests failed to confirm those first results, scientists reluctantly concluded that the large amount of oxygen had probably been produced by a simple chemical reaction between water vapor and some unidentified oxygen-rich compound in the soil sample...
...show begins, a dozen drably dressed country people, simple villagers caricatured with half-masks, wander into the tent's single ring. They look timidly at the ropes and rigging, the aerialists' gear. . What if . . . Whoosh! Colored smoke floods into the ring; lights swirl. A mysterious sprite materializes from vapor: the beautiful and alarming Queen of the Night (Angela Laurier) is here, not just to call the circus into being but to transform the peasants themselves into clowns and acrobats. Instantly a fat old uncle (Michel Barette) is undressed, then recostumed as -- Help! -- the show's ringmaster...