154 



TABLE 146.— THERMAL EXPAN8I0N OF GA8E8 



Temperatures in °C 



Coefficient at constant volume 



Substance 

 Air 



0°-100° 



Argon , 



Carbon dioxide 



" 0°-20°. 



" o°-40°. 



" 0°-100° 



" 0°-20°. 



" 0°-100° 



" 0°-100° 

 Carbon monoxide . . 



Helium 



Hydrogen 16°-132°. 



15°-132°. 



12°-185°. 



0°-100° 



Nitrogen 13°-132°. 



9°-133°. 



0°-20° . . 



0°-100° . 



Oxygen 11°-132°. 



9°-132° . 



11 -132°. 



Nitrous oxide 



Sulfur dioxide SO». 



Pressure 



cmHg 



.6 

 1.3 



10.0 

 25.4 

 75.2 

 100.1 

 76.0 

 200.0 

 2000. 

 10000. 

 51.7 

 76.0 

 1.8 

 5.6 

 74.9 

 51.8 

 51.8 

 51.8 

 99.8 

 99.8 

 100.0 

 76. 

 56.7 

 .0077 

 .025 

 .47 

 .93 

 11.2 

 76.4 

 100.0 

 .06 

 .53 

 100.2 

 100.2 

 76. 

 .007 

 .25 

 .51 

 1.9 

 18.5 

 75.9 

 76. 

 76. 



Coeffi- 

 cient 



x 

 100 



.37666 



.37172 



.36630 



.36580 



.36660 



.36744 



.36650 



.36903 



.38866 



.4100 



.3668 



.36856 



.36753 



,36641 



.37264 



.36985 



.36972 



.36981 



.37335 



.37262 



.37248 



.36667 



.3665 



.3328 



.3623 



.3656 



.37002 



.36548 



.36504 



.36626 



.3021 



.3290 



.36754 



.36744 



.36682 



.4161 



.3984 



.3831 



.36683 



.36690 



.36681 



.3676 



.3845 



Coefficient at constant pressure 



Substance 



Air 



" 0°-100° 



Hydrogen 0°-100° 



Carbon dioxide 



" 0°-20°. 

 " »_4 o 



" 0°-100° 

 " 0°-20°. 

 " 0°-100° 



« o_ 20 o 

 " O o_ 100 = 



" 0°-7.5° 

 "64°-100° 



Carbon monoxide . . 



Nitrous oxide 



Sulfur dioxide 



Water- vapor* 



0°-119° 

 0°-141° 

 0°-162° 

 0°-200° 

 L0°-247° 



Pressure 



cmHn 



76. 

 257. 

 100.1 



100.0 

 200 Atm. 

 400 " 

 600 " 

 800 " 



76. 



51.8 



51.8 



51.8 



99.8 



99.8 

 137.7 

 137.7 

 2621. 

 2621. 



76. 



76. 



76. 



98. 



76. 



76. 



76. 



76. 



76. 



Coeffi- 

 cient 

 x 

 100 



.3671 



.3693 



.36728 



.36600 



.332 



.295 



.261 



.242 



.3710 



.37128 



.37100 



.37073 



.37602 



.37410 



.37972 



.37703 



.1097 



.6574 



.3669 



.3719 



.3903 



.3980 



.4187 



.4189 



.4071 



.3938 



.3799 



Thomson has given (Encycl. Brit. 

 "Heat") the following for the calculation 

 of the expansion, E, between 0° and 

 100°C. Expansion is to be taken as the 

 change of volume under constant pres- 

 sure : 

 Hydrogen, E = .3662(1 — .00049 V /v) 

 Air, E = .3662(1 — .0026 V/v) 



Oxygen, E = .3662(1 — .0032 V/v) 

 Nitrogen, E = .3662(1 — .0031 V/v) 

 CO* E = .3662(1 — .0164 V/v) 



V/v is the ratio of the actual density of 

 the gas at 0°C to what it would have at 

 0°C and 1 atm pressure. 



SMITHSONIAN PHYSICAL TABLES 



