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<br />FORMATION OF RAIN THROUGH HYGROSCOPIC SEEDIN(; <br /> <br />HYGROSCOPIC PARTICLES: <br />Extremely Moisture Absorbent <br />Grow in Low Humidity Air below Cloud Base <br /> <br />EXAMPLES OF HYGROSCOPIC MATERIAL: <br />Common Table Salt <br />Ammonium Nitrate - Urea Fertilizer <br /> <br />OBJECTIVE OF HYDROSCOPIC SEEDING: <br />Introduce Large Drops into Cloud <br />Large Drops Collide with Small Cloud Droplets <br />and Grow into Raindross (Coalescence) <br />Raindrops Heavy and Large Enough to Fall <br />out of Cloud and Reach Ground <br /> <br />GROWTH OF <br />HYGROSCOPIC <br />PARTICLE <br /> <br /> <br />( <br />(~ r~ il <br />, ~ !~ <br />( 12Min oCt '1\;, <br />9-ffi --, )) <br />/ 14Mln.~.~ I, <br />/""\L:IO Min, E ~ ~ 00 '\ <br />'flCA J 00,00;.) <br /> <br />/ //1 'l\'~ <br />I f I :1 <br />IF' ,} <br />d : B .JjH ~ "" 0 .I",ffi <br />JOMin io~ <br />I '.~ <br />lA ' <br />--- - - ";:~"'~ <br />~~ <br /> <br /> <br />A - Hygroscopic particle released (.0008 inch diameter) <br />B - Particle grows by condensation to .003 inch diameter <br />C - Particle grows by coalescence to .2 inch diameter and <br />breaks up into smaller drops <br />D & E - Drops formed at C grow and break up again when <br />diameter equals .2 inch <br />F - Drops fall out the base of cloud <br /> <br />24 <br />