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/ft3
1 lb/gal
1 lb/US gal
16.0185 kg/m3
99.7763 kg/m3
119.826 kg/m3
Pressure
1 lb/in2
1 atm
1 MPa
1 N/m
1 mm Hg (0o)
1 in Hg (0o)
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 in3
1 ft3
1 gal
1 US gal
1 US barrel
16.8371 cm3
0.0283168 m3
4.54609 dm3
3.78541 dm3
0.158987 m3
Volume flow 1 ft3/min
1 gal/min
40.776 m3/day
6.5463 m3/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 oF (1.8 x
oC) + 32
Viscosity (dynamic)
1 P
1 lbf/(ft s) or 1 pdl s/ft2
1 slug/(ft s) or 1 lbf s/ft2
0.1 Pa s
1.48816 Pa s
47.8803 Pa s
Viscosity (kinematic) 1 St
1 ft2/s
1 cm2/s
9.29030 dm2/s