167 



TABLE 162.— LATENT AND TOTAL HEAT OF VAPORIZATION, FORMULAE 



r = latent heat of vaporization at /°C; H = total heat from fluid at 0° to vapor at t° C. 

 T° refers to Kelvin scale. Same units as preceding tahle. 



Acetone, C 3 H„0 H = 140.5 + .36644/ - .000516/' 



= 139.9 + .23356/ + .00055358/' 



r = 139.9— .27287/ + .0001571 /" 



Benzene, C„H„ H = 109.0 + .24429/ — .0001315/' 



Carbon dioxide r = 118.485(31 -/) — .4707(31 — /)' 



Carbon bisulfide, CS 2 H = 90.0 + .14601/ - .0004123/' 



H = 89.5 + .16993/ — .0010161/- + .0 3 342/ 3 



r = 89.5 — .06530/ - .0010976/' + .0.342/ 3 

 Carbon tetrachloride, CC1«. ... H = 52.0 + .14625/ — .000172/' 



H = 5l.9 + .17867 7 - .0009599/' + .0.3733/ 3 



r = 51.9 - .01931/ - .0010505/' + .0 5 3733/ : " 

 Chloroform, CHC1 3 H = 67.0 + .1375/ 



H = 67.0 + .14716/ — .0000937/' 



r =67.0 — .08519/ — .0001444/' 

 Ether, C,H 10 O H = 94.0 + .45000/ - .0005556/' 



r — 94.0 — .07900/ — .0008514/' 



Molybdenum r = 177000 — 2.57(cal/g-atom) 



Nitrogen, N, r = 68.85 — .27367 



Nitrous oxide, N,0 r = 131.75(36.4 — /) — .928(36.4 — /)' 



Oxygen, 2 r = 69.67 — .20807" 



Platinum r = 128000 — 2.57'(cal /g-atom) 



Sulfur dioxide r = 91.87 — .3842/ — .000340/' 



Tungsten r = 217800 — 1.87"(cal/g-atom) 



Water, H 2 H = 638.9 4- -3745(/ - 100) — .00099(/ — 100)' 



r = 94.210(365 _/)■»«"» (See Table 165) 



TABLE 163.— LATENT HEAT OF VAPORIZATION OF AMMONIA 



Calories per gram 



When a fluid undergoes a change of pressure, there occurs a transformation of energy into heat 

 or vice versa, which results in a change of temperature of the substance unless a like amount of 

 heat is abstracted or added. This change expressed as the heat so transformed per unit change 

 of pressure is the "latent heat of pressure variation." It is expressed below as J g" 1 kg" 1 cm 2 . 



Temperature °C. —44.1 —39.0 —24.2 —.2 +16.5 +26.5 +35.4 +40.3 

 Latent heat .... - .055 - .057 - .068 -.088 - .107 - .123 - .140 - .150 



SMITHSONIAN PHYSICAL TABLES 



