Volume-mass 



1 cubic foot of sea water =64 pounds 



1 cubic foot of fresh water = 62.428 pounds at temperature of nnaximun 



density (4° C = 39°2 F) 



1 cubic foot of ice =56 pounds 



1 displacement ton =35 cubic feet of sea water* 



= 1 long ton 



(1) Taken in part from Bowditch (H.O. Pub. and the U.S. Navy Diving Manual, NAVSHIPS 0994-001-9010) 



(2) All values in this appendix are based on the following relationships: 



1 inch = 2.54 centimeters* 



1 yard = 0.9144 meter* 



1 pound (avoirdupois) = 0.45359237 kilogram* 



1 nautical mile = 1852 meters* 



Absolute zero = (-)273?15 C = (-)459?67 F. 



COMMONLY USED FORMULAS 



Symbols and Notes 



Lifting Capacity (in Pounds) 



Fresh water (V X 62.4) = Weight of lifting unit 

 Salt water (V X 64) = Weight of lifting unit 



Miscellaneous Formulas 



Partial Pressure of a gas (in psi) - 

 P.P. = [(D + 331 X .4551 X % of gas 



( D + 33 

 P.P.= 



33 



X % of gas, in ata. 

 P.P. = [D -I- 331 X % of gas, in fsw. 

 Time between stops in seconds — 



J = 'D|eft - Darrived) X 60 

 F.P.M. 



Formula for Areas 



The area of a square or rectangle — 



A = LX W 

 The area of a circle — 



A = .7854 X Dia.2 or A = TTR^ 



Emergency Hose Test [(D X .445) +501 X 2 

 (Hold pressure for 10 minutes) 



722 



