METEOROLOGY — THEORY 211 
first two terms of its expansion. Therefore h and t, where 
t= T — 273 
—ah/T A ho mani 
M,= Apo € + ae € cAT, is the standard centigrade temperature. In this table, 
a it is assumed that p, = 1,000 mb. 
ae Ma = H(T,h) + G(T,h) AT, (11) Table 4 gives G(T',h). The term GAt in equation 
(11) is very small at altitudes less than 500 m and 
Apy ~™T for this range of altitudes may be safely neglected. 
where H(T,h) = Spun Since it is assumed in these tables that p, = 1,000, 
the value of Mz read from the tables should be multi- 
and G(T,h) = Apo ee (12) plied by p,/1,000, where p, is the actual air pressure 
an ahe ; ae A : 
27 i at sea level. This step may, however, be eliminated in 
Table 3 gives the quantity H(7',h) as a function of most cases, particularly as the physically important 
TaBLe 3G. H for? from 30 C (86 F) to 40 C (104 F); h to 2,000 m (6,562 ft). 
po = 1,000 mb at sea level 
Rmy\ 30 31 32 33 34 35 36 37 38 39 40 Vik (ft) 
0.0 
32.8 
65.6 
98.4 
131.2 
164.0 
248.1 
328.1 
492.1 
656.2 
820.2 
984.3 
1,148.0 
1,312.0 
1,476.0 
1,640.0 
1,969.0 
2,297.0 
2,625.0 
2,953.0 
3,281.0 
4,921.0 
6,562.0 
86.0 87.9 89.6 91.4 93.2 95.0 96.8 98.6 100.4 102.2 104.0 ae 
iF 
Taste 4. G for 2 from 50 m (164 ft) to 2,000 m (6,562 ft) and ¢ from —30 C (—22 F) to 40 C (104 F). 
iC—> 
h (m)\. —30 -25 -20 -15 -10 -5 +0 +5 +10 +15 +20 +425 +30 +35 +40 VA. 
0.004 0.004 0.004 0.003 0.003 0.003 
0.008 0.008 0.007 0.007 0.007 0.006 
0.012 0.012 0.011 0.010 0.010 0.009 
0.016 0.015 0.014 0.014 0.013 0.012 
0.020 0.019 0.018 0.017 0.016 0.015 
0.024 0.023 0.021 0.020 0.019 0.018 
0.028 0.026 0.025 0.023 0.022 0.021 
0.032 0.030 0.028 0.027 0.025 0.024 
0.035 0.033 0.031 0.030 0.028 0.027 
0.039 0.037 0.035 0.033 0.031 0.030 
0.046 0.044 0.041 0.039 0.037 0.035 
0.053 0.050 0.047 0.045 0.043 0.040 
0.060 0.057 0.053 0.051 0.048 0.046 
0.066 0.063 0.059 0.056 0.053 0.051 
0.073 0.069 0.065 0.062 0.059 0.056 
0.102 0.097 0.092 0.087 0.082 0.078 
0.127 0.121 0.114 0.109 0.103 0.098 
—22.0 -13.0 —4.0 +5.0 140 23.0 32.0 41.0 50.0 59.0 77.0 86.0 95.0 104.0 
