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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />- 71 - <br /> <br />M the molecular wei~ht of water, R the gas constants T the temperature in oKs <br />o . <br /> <br />and lC the thermal conductivity of air:. If the ice particle is plate-like, it <br /> <br />can be represented by a circular disc of radius r in whi~h c~se <br /> <br />c=t!. <br />1f <br /> <br />(3.66) <br /> <br />and <br /> <br />~ . 8rGS . <br />dt 1. <br /> <br />(3.67) <br /> <br />3.3.2 . Growth by'Rimln,; <br />The rate 01 increase In the mass of an ice particle by rlm1nl co be <br />written as <br /> <br />'~ · A(Vc - Vd)EX <br /> <br />(3.68) <br /> <br />~.~ A ffll ...". ."ood,.,o ornlJ' CloCl'Hma1. ."0' of the p~tiol. involved. in <br />~1,. capt.1 of 4l'oplet't V c and V c1 the tef'l'lllnal fal t 11)..4. of the ice particle <br />\ <br />4ft4 the c1ou4 4zIoplet. t"..peetlve1y, E the coll.ction .ffielency. and. X tbe <br />1!qui4 water content of tba cloud. In tha oue of plate-like Ol' .pher1cal <br />iCI pDticll' A . 'lf1'2, whirl r i. tha Z'acu',ul of the equivalent 411.0 ~ a <br />plate-like p&l'tiG~ an4 it i. equal to the radius of. the particle 1f it 1. <br />.,bctial. Tblt'efozte, <br /> <br />~ . 'If~2 (Ve · V4)EX <br /> <br />(3.69 ) <br /> <br />