• 



Table C-5 - Continued 



QUANTITIES AND UNITS OF MECHANICS (Cont.) 



Multiply 



M. 



To Obtain 



WORK AND ENERGY* 



British ttiermal units (Btu) 



Btu per pound .... 

 Foot-pounds 



Horsepower 



Btu per hour 



Foot-pounds per second 



0.252* Kilogram calories 



1,055.06 Joules 



2.325 (exactly) . . . Joules per gram 



1.35582* Joules 



POWER 



745.700 Watts 



0.293071 Watts 



I .35582 Watts 



HEAT TRANSFER 



Btu in/hr ft^ deg F (i<, thermal 

 conductivity) 



Btu ft/hr ft^ deg F . . . . 

 Btu ft^ deg F (C, thermal 



conductance) 



Deg F hr ft^/Btu (R, thermal 



resistance) 



Btu/lb deg F (c, heat capacity) 



Btu/ lb deg F 



Ft^/hr (thermal diffusivity) 



1.442 Milliwatts/cm deg C 



0.1240 Kg cal/hr m deg C 



1.4880* Kg cal m/hr m^ deg C 



0.568 Mi 1 I iwatts/cm^ deg C 



4.882 Kg cal/hr m^ deg C 



1.761 Deg C cm^/mi I I i watt 



4.1868 J/g deg C 



I .000* Cal /gram deg C 



0.2581 Cm^/sec 



0.09290* M^/hr 



# 



WATER VAPOR TRANSMISSION 



Grains/hr ft*- (water vapor 



transmission) 

 Perms (permeance) 

 Parm-inches (permeability) 



16.7 Grams/24 hr m^ 



0.659 Metric perms 



1.67 Metric perm-centimeters 



Mu 1 1 i p I y 



Cubic feet per square foot per day 



(seepage) 



Pounds-seconds per square foot 



(viscosity) 



Square feet per second (viscosity) 



Fahrenheit degrees (change)*. 



Volts per mil 



Lumens per square foot (foot-candles) 



Ohm-circular mils per foot . . . . 



Millicuries per cubic foot . . . . 



Mi I I lamps per square foot . . . . 



Gal Ions per square yard 



Pounds per inch 



OTHER QUANTITIES AND UNITS 

 By 



To Obtain 



304.8* Liters per square meter per day 



4.8824* Kilogram second per square meter 



0.02903* (exactly) . . Square meters per second 



5/9 exactly Celsius or Kelvin degrees (change)* 



0.03937 Kilovolts per millimeter 



10.764 Lumens per square meter 



0.00I662» Ohm-square millimeters per meter 



35.3147* Millicuries per cubic meter 



10.7639* Mi I I lamps per square meter 



4.527219* Liters per square meter 



0.17858* Kilograms per centimeter 



C-43 



