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Materials for engineering, 3rd Edition - (Malestrom)

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234<br />

Appendix II<br />

Fracture toughness<br />

1 psi √in = 1.099 × 10 –3 MPa m 1/2<br />

Energy<br />

1 erg = 10 –7 J<br />

1 eV = 1.602 × 10 –19 J<br />

1 cal = 4.187 J<br />

1 Btu = 1054 J<br />

1 ft-lbf = 1.356 J<br />

Power<br />

1 hp = 0.746 kW<br />

1 erg s –1 = 10 –10 kW<br />

1 ft lbf s –1 = 1.36 × 10 –3 kW<br />

Surface energy<br />

1 erg cm –2 = 1 mJ m –2<br />

Viscosity<br />

1 poise = 0.1 N s m –2<br />

Specific heat<br />

1 cal g –1 K –1 = 4.188 kJ kg –1 K –1<br />

Prefixes<br />

T tera = 10 12 m milli = 10 –3<br />

G giga =10 9 µ micro = 10 –6<br />

M mega = 10 6 n nano = 10 –9<br />

k kilo = 10 3 p pico = 10 –12<br />

c centi = 10 –2 f femto = 10 –15

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