Following is a list of approximate conversion factors, useful for “back-of-the-envelope” estimates. None of them is exact, but most are accurate to within about ±10%.
? 1(atm) ? 1 bar
? 1(Btu) ?1 kJ
? 1(hp) ? 0.75 kW
? 1(inch) ? 2.5 cm
? 1(lbm) ? 0.5 kg
? 1(mile) ? 1.6 km
? 1(quart) ? 1 liter
? 1(yard) ? 1 m
Conversion Factors
The exact conversion factors are:
1 atm = 1.01325 bar
1 Btu = 1.055 kJ
1 hp = 0.7457 kW
1 inch = 2.54 cm
1 lbm = 0.45359 kg
1 mile = 1.6093 km
1 quart = 0.9464 liter
1 yard = 0.9144 m
Some other useful ones to remember are:
1 ft = 30.48 cm ? 30 cm = 0.3 m ,
1 bar = 14.50 psi ? 15 psi, and
1 mile/hour = 0.447 m/s ? 0.5 m /s.
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