United States Bureau of Mines—Study and Control of Fires in Abandoned Mines and Waste Banks - Coal and Peat Fires: A Global Perspective - page 270

Table 16.1.1
Conversion factors.

English Units Metric Units

Unit Abbreviation Unit Abbreviation

1 Acre ac or A 0.40 Hectare ha

1 British Thermal Unit BTU 252 Calories Cal

1054 Joules J

Yd 3 m 3 1 Cubic yard Cubic meter

1 Degree Fahrenheit °F 5/9(°F - 32) °C

1 Foot ft 0.305 Meter m

1 Gallon gal 3.8 Liter l

1 Gallon per minute gpm 3.8 Liter per minute lpm

10 6 Joules 1 Kilowatt-hour kwh 3.6 J

10 6 Joules/second 1 Megawatt MW 1 J/sec

1 Mile mi 1.6 Kilometer km

ft 2 m 2 1 Square foot 0.093 Square meter

ft 3 m 3 1 Cubic foot 0.028 Cubic meter

1 Ton t 0.91 Metric ton mt