WE have found that in a hot-wire Clusius column operating with water-vapour, molecules containing oxygen-18 concentrate at the top of the column. This is an unexpected result, since it implies ...

When the sun shines, it causes water to warm up, turning it into a gas - water vapour. This process is called evaporation. The water vapour rises and collects in the sky as clouds. When the water ...

Publications of the Astronomical Society of the Pacific, Vol. 116, No. 823 (September 2004), pp. 876-885 (10 pages) ABSTRACT Water vapor, while usually a small contributor to the atmospheric ...