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 APPENDIX B
INTERNATIONAL SYSTEM OF UNITS (Continued)
U.S.
INTERNATIONAL
APPROXIMATE
QUANTITY
CUSTOMARY UNIT
(SI) UNIT
CONVERSION
PRESSURE,
ton-force per
megapascal(MPa)
1 tonf/in2 = 13.7895 MPa
STRESS
square inch
(tonf/in2)
ton-force per
kilopascal(kPa)
1 tonf/ft2 = 95.7605 kPa
square foot
(tonf/ft2)
pound-force per
kilopascal(kPa)
1 lbf/in2
=
6.894 76 kPa
square inch
(lbf/in2)
pound-force per
pascal(Pa)
1 lbf/ft2
= 47.8803 Pa
square foot
(lbf/ft2)
WORK,
kilowatthour(kWh) megajoule(MJ)
1 kWh
=
3.6 MJ
ENERGY
British thermal
kilojoule(kJ)
1 Btu
=
1.055 06 kJ
QUANTITY
unit(Btu)
OF HEAT
foot-pound-force joule(J)
1 ft.lbf
=
1.355 82 J
(ft.lbf)
POWER,
horsepower(hp)
kilowatt(kW)
1 hp
=
0.745 700 kW
HEAT
British thermal
watt(W)
1 Btu/h
=
0.293 071 W
FLOW
unit per hour
RATE
(Btu/h)
foot pound-force
watt(W)
1 ft.lbf/s =
1.355 82 W
per second
(ft.lbf/s)
COEF
Btu per square
watt per square
1 Btu/
=
5.678 26 W/
FICIENT
foot hour
meter kelvin
ft2.h. degF
m2.K
OF HEAT
degree
TRANSFER
Fahrenheit(Btu/
(W/m2.K)
(U-value)
ft2.hr. degF)
THERMAL
Btu per foot
watt per meter
1 Btu/
=
1.730 73 W/
CONDUC-
hour
kelvin (W/m.K)
ft.h. degF
m.K
TIVITY
Degree Fahrenheit
(K-value)
(Btu/ft.hr. degF)
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