Formula Symbols - F
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Formula Symbols
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F
| Symbol | Greek Symbol | Definition | US | Metric | Value |
|---|---|---|---|---|---|
| \(K\) | - | factor | - | - | - |
| \(FS\), \(\;FOS\) | - | factor of safety | dimensionless | dimensionless | - |
| \(FHP\), \(\;HP_f\) | - | fan horsepower | \(hp\) | - | - |
| \(n\) | - | fan speed | \(ft\;/\;sec\) | \(m\;/\;s\) | - |
| \(f\) | - | Fanning friction factor | dimensionless | dimensionless | - |
| \(Fa\) | - | Faraday constant | constant | constant | \(96\;485.332...\;C\;mol^{-1}\) |
| \(k_f\) | - | Fermi angular wave vector | - | - | - |
| \(G_f^0\) | - | Fermi coupling constant | constant | constant | \(1.166\;3787\;x\;10^{-5}\;GeV^{-2}\) |
| \(E_f\), \(\;\epsilon_f\) | epsilon | Fermi energy | - | - | - |
| \(h\) | - | film coefficient | \(Btu\;/\;hr-ft^2- F\) | \(W\;/\;m^2 - K\) | - |
| \(h\) | - | film thickness | \(in\) | \(mm\) | - |
| \(a_f\) | - | final acceleration | \(ft\;/\;sec^2\) | \(m\;/\;s^2\) | - |
| \(\omega_f\) | omega | final angular velocity | \(ft\;/\;sec\) | \(m\;/\;s\) | - |
| \(l_f\) | - | final length | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \(x_f\) | - | final position | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \(T_f\) | - | final temperature | \(^\circ F\) | \(C\) | - |
| \(t_f\) | - | final time | \(sec\) | \(s\) | - |
| \(v_f\) | - | final velocity | \(ft\;/\;sec\) | \(m\;/\;s\) | - |
| \(V_f\) | - | final volume | \(in^3 \;or\; ft^3\) | \(mm^3 \;or\; m^3\) | - |
| \(\alpha\) | alpha | fine structure constant | dimensionless constant | dimensionless constant | \(7.297\;352\;5693\;x\;10^{-3}\) |
| \(c_1\) | - | first radiation constant | constant | constant | \(3.741\;771\;852...\;x\;10^{-16}\;W\;m^2\) |
| \(c_1l\) | - | first radiation constant for spectral radiance | constant | constant | \(1.191\;042\;972...\;x\;10^{-16}\;W\;m^2\;sr^{-1}\) |
| \(t_f\) | - | flange thickness | \(in\) | \(mm\) | |
| \(FS\) | - | flash steam | percent | percent | - |
| \(T\) | - | flight time | \(sec\) | \(s\) | - |
| \(q\) | - | flow | \(ft^3 \;/\; sec\) | \(m^3\;/\;s\) | - |
| \(C_v\), \(\;K_v\) | - | flow coefficient | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(Q\) | - | flow rate | \(ft^3 \;/\; sec\) | \(m^3 \;/\; s\) | - |
| \(Q\) | - | flow rate capacity | \(ft^3 \;/\; sec\) | \(m^3 \;/\; s\) | - |
| \(Q_a\) | - | flow rate of air | \(CFM\) | \(LPM\) | - |
| \(Q_s\) | - | flow rate of steam | - | - | - |
| \(Q_w\) | - | flow rate of water | \(gal\;/\;min\) | \(L\;/\;m\) | - |
| \(Q\), \(\;V\) | - | flow velocity | - | - | - |
| \(P_c\) | - | fluid critical pressure | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(\rho_f\) | rho | fluid density | \(lb\;/\;ft^3\) | \(kg\;/\;m^3\) | - |
| \(Y\) | - | fluid expansion factor for vapor flow | - | - | - |
| \(h\) | - | fluid head | \(ft\) | \(m\) | - |
| \(\Delta E\) | - | fluid mehanical energy loss | \(ft-lbf\) | \(J\) | - |
| \(\xi\) | xi | fluid resistance coefficient | - | - | - |
| \(P_v\) | - | fluid vapor pressure | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(v\) | - | fluid velocity | \(ft\;/\;sec\) | \(m\;/\;s\) | - |
| \(\Delta v_f\) | - | fluid velocity change | \(ft\;/\;sec\) | \(m\;/\;s\) | - |
| \( F\) | - | force | \(lbf\) | \(N\) | - |
| \(F_d\), \(\;\Delta F\) | delta | force differential | \(lbf\) | \(N\) | - |
| \(F_a\) | - | force of air resistance or drag | \(lbf\) | \(N\) | - |
| \(P\) | - | force of impression | \(lbf\) | \(kg\) | - |
| \(F\) | - | formality | - | \(FW\;/\;L\) | - |
| \(FW\) | - | formula weight | \(lbm\;/\;lbmol\) | \(kg\;/\;kmol\) | - |
| \(Fo\) | - | Fourier number | dimensionless | dimensionless | - |
| \(g\) | - | Fourier's law | - | - | - |
| \(x\) | - | fraction | - | - | - |
| \(f\) | - | fraction split | - | - | - |
| \(v_f\) | - | friction velocity | - | - | - |
| \(d_{\infty}\) | - | free steam density | \(lb\;/\;ft^3\) | \(kg\;/\;m^3\) | - |
| \(\rho_{\infty}\) | rho | free steam pressure | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(v_{\infty}\) | - | free steam velocity | \(ft\;/\;sec\) | \(m\;/\;s\) | - |
| \(F\) | - | Fresnel number | dimensionless | dimensionless | - |
| \(f\), \(\;\nu\) | nu | frequency | \(Hz \;or\; ft\) | \(HZ \;or\; m\) | - |
| \(Q\) | - | fresh air introduction rate | \(cfm\) | \(lpm\) | - |
| \(f\) | - | friction | - | \( N\) | - |
| \(\mu\) | mu | friction coefficient | dimensionless | dimensionless | - |
| \(h_fd\) | friction discharge head | \(ft\) | \(m\) | - | |
| \(f\) | - | friction factor | - | - | - |
| \(F_f\) | - | friction force | - | - | - |
| \( FHP\) | - | friction horsepower | \(hp\) | - | - |
| \(FL\) | - | friction loss | - | - | - |
| \(\xi\), \(\;C\) | xi | friction loss coefficient | - | - | - |
| \( FP\) | - | friction pressure | \(in \; wg\) | \(Pa\) | - |
| \(h_{fs}\) | friction suction head | \(ft\) | \(m\) | - | |
| \(RA\) | - | fractional reduction in area | - | - | - |
| \(F\) | - | Fresnel number | dimensionless | dimensionless | - |
| \(Fo\) | - | Fourier number | dimensionless | dimensionless | - |
| \(Fr\) | - | Froude number | dimensionless | dimensionless | - |
| \(FAR\) | - | fuel-air ratio | \(lbm\) | \(kg\) | - |
| \(s'\) | - | fuel economy | \(mi\;/\;gal\) | \(km\;/\;L\) | - |
| \(m_f\) | - | fuel mixture | \(lbm\) | \(kg\) | - |
| \(FU\) | - | fuel utilization | - | - | - |
| \(f\) | - | function | - | - | - |
| Symbol | Greek Symbol | Definition | US | Metric | Value |
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