Materials for engineering, 3rd Edition - (Malestrom)

234
Appendix II
Fracture toughness
1 psi √in = 1.099 × 10 –3 MPa m 1/2
Energy
1 erg = 10 –7 J
1 eV = 1.602 × 10 –19 J
1 cal = 4.187 J
1 Btu = 1054 J
1 ft-lbf = 1.356 J
Power
1 hp = 0.746 kW
1 erg s –1 = 10 –10 kW
1 ft lbf s –1 = 1.36 × 10 –3 kW
Surface energy
1 erg cm –2 = 1 mJ m –2
Viscosity
1 poise = 0.1 N s m –2
Specific heat
1 cal g –1 K –1 = 4.188 kJ kg –1 K –1
Prefixes
T tera = 10 12 m milli = 10 –3
G giga =10 9 µ micro = 10 –6
M mega = 10 6 n nano = 10 –9
k kilo = 10 3 p pico = 10 –12
c centi = 10 –2 f femto = 10 –15