CHEMISTRY. 



643 



Fahr. 



—123 

 —128 

 —144 

 —152 

 —152 

 —152 

 —152 

 —152 

 —152 

 —154 

 —166 

 —171 

 —171 

 —175 

 —175 

 —177 

 —180 

 —193 

 —200 

 —202 

 —209 

 —218 

 —219 



—220 

 —220 



—220 



—220 



Cent. 



— 86 



— 87- 



— 98 

 —102 

 —102 

 —102 

 —102 

 —102 

 —102 

 —103 

 —110 

 —113 

 —113 

 —115 

 —115 

 —116 

 —118 

 —125 

 —129 

 —130 

 —134 

 —139 

 —139 -5 



—140 

 —140 



—140 



—140 



Physical conditions dependent on temperature. 



Marsh gas boils at 40 atmospheres pressure 



Liquid nitrous oxide boils 



Marsh gas bolls at 25 atmospheres pressure 



Amyl alcohol, an oily liquid 



Silicou duorido, a white mass 



Arsenetted hydrogen liquid 



Hydrochloric acid boils 



Chlorine in orange crystals 



Ethylene boils 



do 



Solid carbon dioxide and ether in vacuo 



Critical point of oxygen, 50 atmospheres pressure . 



Marsh gas boils at 16 atmospheres pressure , 



Solid carbon dioxide in vacuo, 25""™ pressure 



Hydrochloric acid a solid 



Carbon disulphide a solid , 



Arsenetted hydrogen in white crystals 



Nitrous oxide boils in vacuo 



Ether solidifies 



Absolute alcohol a solid , 



Amyl alcohol a solid 



Ethylene boils in vacuo 



Critical point of carbon monoxide, 35.5 at press- 

 ure. 



Critical point of air, pressure 39.0 atmospheres. . 



Calculated teniperature of carbon dioxide snow in 

 vacuo. 



Hydrogen compressed to 650 atmospheres and 

 pressure released produces momentary liquefac- 

 tion and solidification. 



Oxygen compressed to 320 atmospheres and press- 

 ure released produces momentary liquefaction. 



Critical point of nitrogen, 35 atmospheres pressure 



Ethylene boils in vacuo 



Carbon dioxide boils at 20 atmospheres pressure. 



Atmospheric air boils at 20 atmospheres pressure. 



Marsh gas boils 



Oxygen boils 



Air boils 



do , 



Carbon monoxide boils 



Nitrogen boils 



Aij- boils in vacuo 



Carbon monoxide solidifies 



Nitrogen boils in vacuo -. 



Hydrogen at 100 to 200 atmospheres liquefies to 

 colorless drops (in glass tubes 0.2°'™ diameter 

 surrounded by oxygen boiling in vacuo). 



Calculated boiling point of hydrogen 



Absolute zero 



Authority. 



Wroblewski. 

 Regnault. 

 Wroblewski. 

 Olzewski. 



Do. 



Do. 



Do, 



Do. 

 Wroblewski. 

 Olzewski. 

 Faraday. 

 Wroblewski. 



Do. 

 Dewar. 

 Olzewski. 



Do. 

 Dewar. 

 Olzewski. 



Do. 

 Do. 

 Do. 



Do. 



Pictet. 



Do. 



Do. 



Olzewski. 



Do. 



Do. 



Do. 

 Wroblewski. 



Do. 

 Olzewski. 

 Wroblewski. 



Do. 

 Olzewski. 



Do. 



Do. 



Do. 

 Wroblewski and 

 Olzewski. 



E. J. Mills. 



Compare note on solid nitrogen under the head " Inorganic." 



Anomalies in the Boiling Points of the Ghloroaceto-nitrils and their 

 Derivatives (by Hermann Bauer). — As a rule the replacement of hydro- 

 gen by chlorine or by oxygen lowers the volatility of organic compounds 

 not inconsiderably, but in certain cases an opposite eft'ect results. Such 

 an Abnormal effect is especially noticed in cyanogen compounds, the vola- 

 tility of which is usually increased by the introduction into the molecule 

 of negative radicals, and this occurs even when the molecular weight is 



