Symbol Definition 



p Mass density of air 

 a 



p Mass Density of water 



(sigma) 



w 



T 



(tau) 

 (phi) 



f 



(psi) 



(omega) 



Standard deviation 

 Also; 2 tt/T 



Surface tension of water 

 Drag force per unit area 



Velocity potential 



Also; Angle of internal friction 



-of earth 

 Also; Phase of diffracted wave 



Aximuth of direction of wave 

 travel 5 in the direction of travel 

 Also 5 Stream function 

 Also; Direction from which the 

 wave comes 



Angular velocity of the earth 



Basic 





unxT/S 

 (in F,Lj 

 T System) 



Example in 

 English Units 



FT2/L^ 





(M/L^) 



slugs/ft^ 



(M/l3) 



slugs ft^ 



l/T 



appropriate 



units 



l/sec 



LFA2 



ft-lbs/ft^ 



F/l2 



lbs/ft^ 



I^/T 



ft^/sec 



(omega) 



Angular velocity 



— 



degrees 

 radians 



l2/T 



degrees 

 ftVsec 



— 



Compass di- 

 rection (true) 



l/T 



radians/sec 



l/T 



radian/sec 



B-10 



