Accessory List

Conversion Factors
F-27382-1 © Copyright 2006 TAC. All Rights Reserved. 379
Conversion Factors
Note: Conversion factors rounded.
PSI x 27.71 = in. H
2
O PSI x .0689 = bar
PSI 2.036 = in. Hg PSI x 68.95 = mbar
PSI x 703.1 = mm/H
2
0 PSI x 6895 = pa
PSI x 51.75 = mm/Hg PSI x 6.895 = kPa
PSI x .0703 = kg/cm
2
When making conversions, remember that a converted value
is no more precise than the original value. Round off the final
value to the same number of significant figures as those in the
original value.
Multiply By To Obtain
Atmospheres (Std.)
760 mm of Mercury at 32°F 14.696 lbs/sq inch
Atmosphere, standard 101.325 kPa
Atmospheres 760 mm of mercury
Atmospheres 29.92 in. of mercury
Atmospheres 33.90 feet of water
Atmospheres
1.0333 kgs/sq cm
(kp/cm
2
)
Atmospheres 14.70 lbs/sq inch
Atmospheres 1.058 tons/sq ft
Bar 0.98692 Atmospheres
Bar 100 kPa
Bar 14.5038 psi
Btu 0.2520 kilogram-calories
Btu 777.5 foot-lbs
Btu 0.000393 horsepower-hrs.
Btu 0.293 watt-hrs.
Btu, IT 1.055 kJ
Btu
⋅ ft/h ⋅ ft
2
⋅ °F 1.731 W/(m ⋅ K)
Btu
⋅ in/h ⋅ ft
2
⋅ °F (thermal conductivity,
k
)
0.1442 W/(m
⋅ K)
Btu/h 0.2931 W
Btu/ft
2
11.36 kJ/m
2
Btu/h ⋅ ft
2
3.155 W/m
2
Btu ⋅ ft
2
⋅ °F
(heat transfer coefficient,
U ) 5.678 W/(m
2
⋅ K)
Btu/lb 2.326 kJ/kg
Btu/lb
⋅ °F (specific heat c
p
) 4.184 kJ/(kg ⋅ K)
Btu/min. 12.96 foot-lbs/sec
Btu/min. 0.02356 horsepower
Btu/min. 0.01757 kilowatts
Btu/min. 17.57 watts
Calorie 0.003968 btu
Calorie, gram 4.187 J
Calorie, kilogram (kilocalorie) 4.187 kJ
Centimeters 0.3937 inches
Centimeters 0.03280 feet
Centimeters 0.01 meters
Centimeters 10 millimeters
Centimeters of mercury 0.01316 atmospheres
Centimeters of mercury 0.4461 feet of water
Centimeters of mercury 136.0 kgs/sq meter
C
on
v
n Fa
c
Centimeters of mercury 27.85 lbs/sq ft
Centimeters of mercury 0.1934 lbs/sq inch
Centipoise, dynamic viscosity, μ 1.00 mPa
⋅ s
Centistokes, kinematic viscosity, ν 1.00 mm
2
/s
CFM 0.000471947 m
3
/s
Clo
0.155 m
2
⋅ K/W
Cubic feet 2.832x10
4
cubic cms.
Cubic feet 1728 cubic inches
Cubic feet 0.02832 cubic meters
Cubic feet 0.03704 cubic yards
Cubic feet 7.48052 gallons U.S.
Cubic feet/minute 472.0 cubic cms/sec
Cubic feet/minute 0.1247 gallons/sec.
Cubic foot water 62.4 pounds at 60°F
Cv (Gpm @ 1 psi ΔP) 0.865
Kvs
(m
3
/h@100 kPaΔP)
Dyne/cm
2
0.100 Pa
EDR hot water (150 Btu/h) 44.0 W
EDR steam (240 Btu/h) 70.3 W
Fuel cost comparison at 100% eff:
Cents/gallon (no.2 fuel oil) 0.0677 S/GJ
Cents/gallon (no. 6 fuel oil) 0.0632 S/GJ
Cents/gallon (propane) 0.113 S/GJ
Cents/kWh 2.78 S/GJ
Cents/therm 0.0948 S/GJ
Feet 30.48 centimeters
Feet 12 inches
Feet 0.3048 meters
Feet 1/3 yards
Feet of water 0.02950 atmospheres
Feet of water 0.8826 inches of mercury
Feet of water 0.03048 kgs/sq cm
Feet of water 62.43 lbs/sq ft
Feet of water 0.4335 lbs/sq inch
Feet of water 2.99 kPa
Feet/min., fpm 0.00508 m/s
Feet/min. 0.01667 feet/sec
Feet/min 0.01829 kilometers/hr.
Feet/min. 0.3048 meters/min
Feet/min. 0.01136 miles/hr.
Feet
2
0.09290 m
2
Feet
2
⋅ h ⋅ °F/Btu
(thermal resistance, R) 0.176 m
2
⋅ K/W
Feet
2
/s, kinematic viscosity, ν 92 900 mm
2
/s
Feet
3
28.32 L
Feet
3
0.02832 m
3
Feet
3
/h, cfh 7.866 mL/s
Feet
3
/min, cfm 0.4719 L/s
Feet
3
/s, cfs 28.32 L/s
Foot-pounds (ft
⋅ lb) 0.001286 btu
Ft
⋅ lb
f
(torque or moment) 1.36 N m
Ft
⋅ lb
f
(work) 1.36 J
Ft
⋅ lb
f
/lb (specific energy) 2.99 J/kg
Ft
⋅ lb
f
/min (power) 0.0226 W
Gallons 3785 cubic centimeters
Gallons 0.1337 cubic feet
Multiply By To Obtain