GROWTH OF CLOUD DROPS BY CONDENSATION 195 
TasiEe 1—Comparison of rate of growth of drops (micron/sec) at various sizes for given initial conditions 
dr/dt (micron/sec) 
(roir)? EES) , F | Fa 
Houghton | quaSdrop) | (email drop) Howell Ea) | 
For ro equals one micron 
0.5 1.26 0.7810 0.3704 0.3486 19.2854 19.9134 1.083 
0.1 2.51 0.6484 0.3073 0.2924 4.0349 4.1553 1.0380 
0.05 2.71 0.5428 0.2574 0.2440 1.8525 1.9063 1.029 
0.01 4.64 0.3321 0.1575 0.1536 0.3540 0.3642 1.029 
0.005 5.85 0.2679 0.1270 0.1245 0.2055 0.2114 1.029 
0.001 10.00 0.1558 0.0739 0.0730 0.0825 0.0848 1.028 
0.0005 12.60 0.1237 0.0587 0.0581 0.0619 0.0636 1.028 
0.0001 25.14 0.0724 0.0843 0.0841 0.0846 0.0355 1.028 
0.00005 27.14 0.0575 0.0272 0.0271 0.0273 0.0281 1.028 
0.00001 46.42 0.0836 0.0159 0.0159 0.0159 0.0164 | 1.028 
0.000005 58.48 0.0267 0.0126 0.0126 0.0126 0.0130 1.028 
0.000001 100.00 0.0160 0.0074 0.0074 0.0074 0.0076 1.028 
For ro equals one-tenth micron 
0.5 0.126 | 7.810 3.704 1.533 190.974 197.219 1.033 
0.1 0.251 | 6.484 32073" || 1.578 39.032 40.166 | 1.029 
0.05 0.271 5.428 2.574 | 1.524 17.579 18.090 1.029 
0.01 0.464 3.321 1.575 1.181 | 3.181 3.270 1.029 
0.005 0.585 2.679 1.270 1.006 1.808 1.859 1.028 
0.001 1.000 1.588 0.739 0.652 0.745 0.768 1.028 
0.0005 1.260 1.237 0.587 0.532 0.569 0.586 1.028 
0.0001 2.514 0.724 0.343 0.325 0.329 0.3388 | 1.028 
0.00005 2.714 0.575 0.272 0.260 0.262 0.270 1.028 
0.00001 4.642 0.336 0.159 0.155 0.156 0.160 | 1.028 
0.000005 5.848 0.267 0.126 0.123 0.124 0.127 1.028 
0.000001 10.000 0.160 0.074 0.073 0.073 0.075 1.028 
For ro equals one-hundredth micron 
0.5 0.0126 78.10 37.03 —174.16 1726.04 1784.69 1.034 
0.1 0.0251 | 64.81 30.73 —115.44 256.03 263.45 1.030 
0.05 0.0271 54.28 25.74 —T77 .22 83.05 85.51 1.029 
0.01 0.0464 33.21 15.75 —23.11 —2.88 —2.96 1.029 
0.005 0.0585 26.79 12.70 —12.26 | —4,24 —4.37 1.028 
0.001 0.0100 15.58 7.39 —1.22 —0.27 —0.29 1.028 
0.0005 0.1260 12.37 5.89 0.48 | 0.80 0.83 1.028 
0.0001 0.2514 7.24 3.43 1.56 1.61 1.65 1.028 
0.00005 0.2714 §.75 PARA 1.55 1.56 1.61 1.028 
0.00001 0.4642 3.36 1.59 1.19 1.19 1.23 1.028 
0.000005 0.5848 2.67 1.26 1.01 1.01 1.04 1.028 
0.000001 1.0000 1.60 0.74 0.65 0.65 0.67 1.028 
air parcel containing a given amount of water creases the vapor mixing ratio w decreases 
vapor decreases either isobarically (fog and 4 
Stratus) or by adiabatic expansion (Cumulus and — paw + wp = paw + 3 >), Piper? BAN; 
Cumulonimbus). The temperature is thus a given ; 
function of time ee 
4 C 
IN, ae ate “= pa) 
(t) (15) 3 T. > PioPnt ATO = paWo 
The total amount of water substance must remain where wo is the water vapor mixing ratio before 
constant, so that as the liquid content wz in- condensation begins. 
