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Fluid Mechanics - Appendix F Constants and Conversion...

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Unformatted text preview: Appendix F Constants and Conversion Factors §F.1 Mathematical constants §F.2 Physical constants §F.3 Conversion factors §F.1 MATHEMATICAL CONSTANTS 71' = 3.14159... 6 = 2.71828... In 10 = 2.30259 . . . §F.2 PHYSICAL CONSTANTS1 Gas law constant (R) 8.31451 I/g-mol - K 8.31451 X 103 kg - mz/s2 ' kg-mol ' K 8.31451 X 107 g - cmZ/s2 ' g-mol - K 1.98721 cal / g-mol - K 82.0578 cm3 atm/g-mol ' K 4.9686 X 104 lbm ftz/ s2 ' lb-mol ' R 1.5443 x 103 ft ~ lbf/lb-mol - R Standard acceleration 9.80665 m/ 32 of gravity (g0) 980.665 cm/s2 32.1740 ft/s2 Joule’s constant (If) 4.1840 I/ cal (mechanical equivalent of heat) 4.1840 X 107 erg/ cal 778.16 ft ' lbf/ Btu Avogadro’s number (N) 6.02214 X 1023 molecules/ g—mol Boltzmann’s constant 1.38066 X 10‘23 I / K (K = R/N) 1.38066 X 10’16 erg/K Faraday’s constant (P) 96485.3 C / g—equivalent Planck’s constant (11) 6.62608 X 10‘34 I ' 5 6.62608 X 10’27 erg - s Stefan—Boltzmann 5.67051 X 10’8 W/m2 - K4 constant (0) Electron charge (6) Speed of light in a vacuum (c) 1.3553 x 10’12 1.7124 x 10’9 1.60218 ><10'19 2.99792 X 108 1 E. R. Cohen and B. N. Taylor, Physics Today (August 1996), pp. BG9—BG13; R. A. Nelson, Physics Today (August 1996), pp. BG15—BG16. cal / s - cmzK4 Btu / hr - ftzR4 C m/s 867 868 Appendix F Constants and Conversion Factors §F .3 CONVERSION FACTORS In the tables that follow, to convert any physical quantity from one set of units to an- ‘3 other, multiply it by the appropriate table entry. For example, suppose that p is given as 101bf/in.2, and we wish to have p in poundals/ ftz. 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