602 



TABLE 638.— RELATIVE HUMIDITY FOR VARIOUS PRESSURES AND 

 DRY-BULB TEMPERATURES 



Vertical argument is the observed vapor pressure which may be computed from the 

 wet-bulb and dry-bulb readings through Tables 634 or 640. The horizontal argument is 

 the observed air temperature (dry-bulb reading). 



Vapor Air temperatures, dry bulb, °C 



pressure , A v 



mmHg 1 2 3 4 S 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 



.5 12 11 11 10 99887766655544433 



1.0 24 23 21 20 18 17 16 15 14 13 13 12 11 10 10 9 9 8 8 7 7 



1.5 35 33 31 29 27 25 23 21 20 19 18 17 16 15 14 13 12 11 11 10 10 



2.0 46 43 40 37 35 32 30 28 27 25 23 22 21 20 18 17 16 15 14 13 12 



2.5 56 52 48 45 42 39 36 34 32 30 28 26 25 23 22 21 19 18 17 16 15 



3.0 67 63 58 54 50 47 44 41 38 36 34 32 30 28 26 25 23 22 20 19 18 



3.5 78 73 68 63 59 55 52 48 45 43 40 38 35 33 31 29 28 26 24 23 22 



4.0 91 85 79 74 69 65 61 57 53 50 47 44 41 39 37 35 32 30 29 27 25 



4.5 99 93 87 81 76 71 67 62 58 55 52 49 46 43 40 38 36 33 31 29 28 



5.0 .... 95 89 83 78 73 68 64 60 56 53 50 47 44 41 39 36 34 32 31 



5.5 96 91 86 81 75 70 66 62 58 55 51 48 45 42 40 37 35 33 



6.0 ,oo 94 88 82 76 72 68 64 60 56 53 50 46 43 40 38 36 



6.5 99 93 89 83 78 72 68 64 60 56 52 49 46 44 41 39 



7.0 JO o 94 88 82 77 72 68 64 60 56 52 49 47 44 42 



7.5 ,oo 94 88 83 77 73 68 65 61 57 54 51 48 46 



8.0 10 o 94 88 83 77 73 68 65 61 57 54 51 48 



8.5 98 92 86 81 76 72 68 63 60 57 53 51 



9.0 97 91 86 81 76 72 67 64 60 56 53 



9.5 97 91 85 80 75 71 67 63 59 56 



10.0 95 89 84 79 74 70 66 62 59 



11.0 96 92 87 82 77 72 67 64 



12.0 94 89 84 79 74 70 



13.0 96 90 85 80 76 



14,0 98 93 88 84 



15.0 97 91 86 



16.0 ,«, 92 



17.0 98 



Vapor 

 pressure 

 mmHg 



1 



2 

 3 



4 



Air temperatures, dry bulb, °C 



34 35 36 37 38 39 40 



3 3 3 2 2 2 2 



6 5 5 5 5 4 4 



8 8 7 7 7 6 6 



20 21 22 23 24 25 26 27 28 29 30 31 32 33 



76665555444433 



12 11 11 10 10 9 9 8 8 7 7 7 6 6 



18 17 16 15 15 14 13 12 12 11 11 10 9 9 



25 23 22 20 19 18 17 16 15 15 14 13 12 12 11 11 10 10 9 9 8 



30 28 27 25 24 23 22 20 19 18 17 16 15 15 14 14 13 12 11 11 10 



36 34 32 30 29 27 26 24 23 21 20 19 18 17 17 16 15 14 13 12 12 



42 39 37 35 34 32 30 28 26 25 23 22 21 20 19 18 17 16 16 15 14 



48 45 42 40 38 36 34 32 30 29 27 26 24 23 22 21 20 19 18 17 16 



(continued) 



SMITHSONIAN PHYSICAL TABLES 



