Page 668 - Air and Gas Drilling Manual

A-6 Air and Gas Drilling Manual
Table A-6: Conversion Factors (English to metric SI)
To convert To obtain
English units Multiply by metric (SI) units
Acceleration ft/sec 2 0.3048 m/sec 2
Area ft 2 0.0929 m 2
2
2
Acre (43,560 ft ) 0.4047 Hectare (100 m )
Density slug/ft 3 515.4 kg/m 3
Energy (work or ft-lb 1.356 N-m (joule)
quantity of heat) ft-lb 3.77 x 10 -7 kWh
Btu (778 ft-lb) 1,055 N-m (joule)
3 3 3
Flowrate ft /sec 0.02832 m /sec (10 L/sec)
Force lb 4.448 N
Length in 25.4 mm
ft 0.3048 m
mile (5,280 ft) 1.609 km

Mass slug 14.59 kg

Power ft-lb/sec 1.356 W (N-m/sec)
hp (550 ft-lb/sec) 745.7 W (N-m/sec)
2
Pressure psi 6,895 N/m (pascal)
2
lb/ft 2 47.88 N/m (pascal)
Specific heat ft-lb/slug-˚ R 0.1672 N-m/kg-K
Specific weight lb/ft 3 157.1 N/m 3

Velocity ft/sec 0.3048 m/sec
Viscosity
Absolute lb-sec/ft 2 47.88 N-sec/m 2
2 2 4
Kinematic ft /sec 0.0929 m /sec (10 St)
3 3
Volume ft 0.02832 m
3
-3
gallon (US) 3.785 L (10 m )