MOVEMENTS OF ATMOSPHERE OULDBERG AND MOHN 



l6 5 



sure is therefore less at the same height than in the surrounding 

 atmosphere. 



If we wish to apply equation (3) to a vertical current whose sec- 

 tion varies, it is necessary to employ the following equation of con- 

 tinuity : 



w 



Fo(Po\ m 

 F \ ~p 



his \ 



(4 bts ) 



However this formula applies only in case the section of the cur- 

 rent varies very slowly. It shows that the velocity diminishes as 

 the section increases, or vice versa, as at the commencement and 

 at the end of the currents. 



Applications 



(1) Calculation of the altitude. 

 Let 



m = 5, 



T = 293° , 



we shall find 



The values of T m represent the virtual temperatures at the height 

 v In the last column we have written numbers that represent 



