# APPENDIX A - Conversion Tables

A.1 Metric System Conversions

 From To Multiply by: Mass ounces grams 28.349 pounds kilograms 0.454 short tons metric tons 0.907 grams ounces 0.035 kilograms pounds 2.205 metric tons short tons 1.102 Volume cubic metres cubic feet 33.31 Temperature °F °C 5/9 (after subtracting 32) °C °F 9/5 (then add 32) Length inches millimetres 25.4 feet centimetres 30.48 yards metres 0.914 miles kilometres 1.609 millimetres inches 0.039 centimetres inches 0.393 metres yards 1.09 kilometres miles 0.62 Area square inches square centimetres 6.5 square feet square metres 0.092 square yards square metres 0.836 square miles square kilometres 2.6 acres hectares 0.404 square centimetres square inches 0.16 square metres square yards 1.195 square kilometres square miles 0.39 hectares acres 2.47

A.2 Heat and Energy

 1 kilowatt-hour = 1 000 watt-hour 1.3410 HP-hour 3 600 000 joules 3 413 BTU 860 kcals 3.518 lb water evaporation from and at 212°F 22.76 lb of water raised from 62 to 212°F 1.595 kg of water evaporation from and at 100°C 9.907 kg of water raised from 20 to 100°C 1 atmosphere = 14.69 lb per sq in = 1.02 kg per sq cm 1 calorie = 0.003968 BTU 1 BTU = 252 calories (gramme) (15°C) 1 BTU = heat required to raise 1 lb water 1°F 1 BTU = 0.00039 HP-hour 1 BTU per min = 17.6 watts 1 cu in = 0.01639 litres 1 watt = 0.00134 HP 1 joule = 1 watt-sec 1 HP = 746 watts p = 3.1416