INDEX 



525 



Optical air mass, 422 



Ounce, conversion factors, 10, 12 



conversion to kilograms, tables, 108 

 Oxygen absorption of solar radiation, 430 

 Ozone, absorption of solar radiation, 428- 

 429 



Parallel, length of one degree, 483 

 Pendulum day, 130 

 Phot, conversion factors, 16 

 Planck's formula, 411 

 Plateau correction, 205 

 Poise, 12 



Polar stereo graphic projection, scale varia- 

 tion, 485 

 Potential temperature, 308-313 

 Pound, conversion factors, 12 



conversion table, 108 

 Pound weight, conversion factors, 14 

 Poundal, 14 



Power, conversion factors, 15 

 Precipitable water in a saturated pseudo- 



adiabatic atmosphere, 327 

 Pressure, lifting condensation, 328-330 



reduction to fixed levels, 203-213 



vapor. (See Vapor pressure.) 

 Pressure altitude diagram, 285 

 Pressure change corresponding to height 



change, 256, 260-262 

 Pressure divided into 1000, two-sevenths 



power of, 316-317 

 Pressure to the two-sevenths power, 314- 



315 

 Pressure units, conversion factors, 13-14 



conversion tables, 31-71 

 Pseudoadiabatic lapse rate, ice stage, 324 



water stage, 323 

 Pseudoadiabats, temperature and pressure 



along, 318-322 

 Psychrometric data, reduction of, centi- 

 grade temperature, 368 



Fahrenheit temperature, 369 



Radiant emittance, 413 

 Radiation, blackbody, 411-413 

 ratio of direct to total, 439 

 relation to average sunshine, 440 

 relation to illumination, 442 

 sky, 420 



solar, extraterrestrial, 414-416 

 optical air mass, 422 

 reaching the ground, 420-422 

 relative spectral intensity, 415 

 spectral distribution at sea level, 



438 

 spectral energy distribution, 416 

 top of the atmosphere, 417-419 



Radiation, 

 solar, 



total solar and sky, 438-439 

 transmission, atmosphere, 433-436 

 clouds, 441 

 dry air, 431 

 moist air, 436-437 

 Radiation absorption, carbon dioxide, 427 

 oxygen, 430 

 ozone, 428-429 

 sea water, 446 

 water, 445 



water vapor, 423-425 

 Radius of curvature, polar stereographic 



map, 486-487 

 Radius of earth, 481 

 Rain gages, relation between depth of 



water and weight, 407 

 Raindrops, size and rate of fall, 396-398 

 Rainfall, condensation rate in ascending 

 moist air, 325 

 quantity corresponding to depth, 407 

 Rankine temperature, conversion formulae, 



17 

 Raoult's law, 374 

 Reaumer temperature, conversion table, 17- 



19 

 Reflectivity, water surface, 444 

 Refraction index, air, 389 

 Relative humidity, computation from psy- 

 chrometric data, 365-369 

 definition, 348, 331-332 

 over salt solutions, 380 

 Reynolds' number, water droplets in air, 



396 

 Rocks, conductivity, density, specific heat, 



405 

 Rod, conversion factors, 9 

 Rossby long-wave formula, 131 



Salt solution, relative humidity over, 380 

 Sand, albedo, 442-443 



Saturated air, virtual temperature incre- 

 ments of, 295-301 

 Saturation, definition, 347 



pseudoadiabats, 318-322 

 Saturation mixing ratio, definition, 347 



over ice, 306-307 



over water, 302-305 

 Saturation vapor pressure, definition, 347 



droplets, 374-379 



over ice, 360-364 



over water, 351-359 



ratio over ice to over water, 370 



salinity 35 percent, 373 



variation with temperature, 372 



