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Unformatted text preview: v rms = 3 RT = 459ms1 , see Table 2.4 1 d) What is the speed of sound in this parcel? v sound = RT = 0 . 683 v rms = 314ms1 ( = c p c v = 7 5 ) 3. A parcel of dry air is expanded adiabatically from 2.3m 3 to 5.4m 3 . Its initial pressure is p = 500hPa, and initial temperature T = 245K. a) What is the mass M of the parcel? M = pV RT = 50000 2 . 3 287 245 =1.64kg b) What is the nal pressure? p = p ( V V ) = 50000 ( 2 . 3 5 . 4 ) 1 . 400 = 151 . 4hPa c) What is the nal Temperature? T = T p p = 245 ( 151 500 ) . 286 =174.0K d) What is the change in enthalpy? H = M c p T = 1 . 64 1005 (174245) =117kJ 2...
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 Spring '07
 NORTH

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