OCR Text |
Show An Atmospherlo Conundrum Which Is heavier, dry nlr or moist air? This Is a question which occasion-nlly occasion-nlly agitates the minds of persons who get to thinking about the weather nnd when such folks have considered It for a time und discussed It with their neighbors, they vvilto to tho nevvsr 1 pers for Informs tlon Before consulting any niithorlt) a man Is apt to re-oson in this f uhlon The nlr absoibs (lie vapor very much as water dissolves sugar and cons, quently there must be a gain In weight for the samo volume If he sh ul 1 write to Prof Willi L Moore, chief of the United States weather bureau In Washington though, he woull ftni that that his own Independent logi was fallacious, Tiof. Moore s.i)s. "a cubic foot of dry air weighs more than a cubic foot of moist air at the samo temperature and pressure. The addition addi-tion of vnpor to a cubic foot of dry nlr enlarges the volume of the mixture If the nlr Is free to expand, as In the atmosphere, at-mosphere, and as the vapor has only about two-thlrds the density of dry air at the same temperature and pressure, the density of the mixture Is Icsa than that of dry air " |