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Appendix D Units and conversion factors
Page D.1
Appendix D Units and conversion factors
The figures in the following table are taken from BS 350: Part 1: March 1974:
Parameter Imperial units Metric equivalent
Length
1 inch
1 foot
25.4 mm
0.3048 m
Mass
1 lb
1 ton
0.45359237 kg
1016.05 kg
Density
1 lb/ft
3
1 lb/gal
1 lb/US gal
16.0185 kg/m
3
99.7763 kg/m
3
119.826 kg/m
3
Pressure
1 lb/in
2
1 atm
1 MPa
1 N/m
1 mm Hg (0
o
)
1 in Hg (0
o
)
68.9476 mbar
1.013250 bar
10 bar
10
-5
bar
1.33322 x 10
-3
bar
33.8639 x 10
-3
bar
Volume or capacity
1 in
3
1 ft
3
1 gal
1 US gal
1 US barrel
16.8371 cm
3
0.0283168 m
3
4.54609 dm
3
3.78541 dm
3
0.158987 m
3
Volume flow
1 ft
3
/min
1 gal/min
40.776 m
3
/day
6.5463 m
3
/day
Mass flow
1 lb/hr
1 ton/hr
10.886 kg/day
1016.05 kg/hr
Energy
1 BTU
1 kWh
1 therm
1.05506 kJ
3.6 MJ
105.506 MJ
Temperature
o
F (1.8 x
o
C) + 32
Viscosity (dynamic)
1 P
1 lbf/(ft s) or 1 pdl s/ft
2
1 slug/(ft s) or 1 lbf s/ft
2
0.1 Pa s
1.48816 Pa s
47.8803 Pa s
Viscosity (kinematic)
1 St
1 ft
2
/s
1 cm
2
/s
9.29030 dm
2
/s