Page 669 - Air and Gas Drilling Manual

Appendix A: Dimensions and Units, Conversion Factors A-7
Table A-7: Conversion Factors (metric SI to English)
To convert To obtain
metric SI units Multiply by English units
2 2
Acceleration m/sec 3.281 ft/sec
Area m 2 10.76 ft 2
2
2
Hectare (100 m ) 2.471 Acre (43,560 ft )
Density kg/m 3 0.001940 slug/ft 3
Energy (work or N-m (joule) 0.7376 ft-lb
quantity of heat) kWh 2.650 x 10 6 ft-lb
N-m (joule) 0.0009480 Btu (778 ft-lb)

3 3 3
Flowrate m /sec (10 L/sec) 35.31 ft /sec
Force N 0.2248 lb
Length mm 0.03937 in
m 3.281 ft
km 0.6215 mile (5,280 ft)

Mass kg 0.06854 slug
Power W (N-m/sec) 0.7375 ft-lb/sec
W (N-m/sec) 0.001341 hp (550 ft-lb/sec)
2
Pressure N/m (pascal) 0.0001450 psi
2 2
N/m (pascal) 0.02089 lb/ft
Specific heat N-m/kg-K 5.981 ft-lb/slug-˚ R
Specific weight N/m 3 0.006365 lb/ft 3

Velocity m/sec 3.281 ft/sec
Viscosity
Absolute N-sec/m 2 0.02089 lb-sec/ft 2
2
4
2
Kinematic m /sec (10 St) 10.76 ft /sec
3 3
Volume m 35.31 ft
-3 3
L (10 m ) 0.2642 gallons (US)