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"F" Formula SymbolsA - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z | ||||||
|---|---|---|---|---|---|---|
| Symbol | Greek Symbol | Definition | English | Metric | SI | Value |
| \(K\) | - | factor | - | - | - | - |
| \(FS\), \(\;FOS\) | - | factor of safety | dimensionless | dimensionless | dimensionless | - |
| \(F\), \(\;T_F\) | - | Fahrenheit | \(F\) | - | - | - |
| \(\eta_f\) | eta | fan efficiency | dimensionless | dimensionless | dimensionless | - |
| \(FHP\), \(\;HP_f\) | - | fan horsepower | \(\large{\frac{lbf-ft}{sec}}\) | \(\large{\frac{Btu}{s}}\) | \(Btu-s^{-1}\) | - |
| \(n\) | - | fan speed | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m-s^{-1}\) | - |
| \(f\) | - | Fanning friction factor | dimensionless | dimensionless | dimensionless | - |
| \(Fa\) | - | Faraday constant | - | \(\large{\frac{C}{mol}}\) | \(C-mol^{-1}\) | \(96\;485.332\;12...\) \(\large{\frac{C}{mol^{-1}}}\) |
| - | - | Faraday's law of induction | - | - | - | - |
| \(k_f\) | - | Fermi angular wavevector | - | - | - | - |
| \(G_f\) | - | Fermi coupling constant | \(\large{\frac{lbf-ft}{ft^3}}\) | \(\large{\frac{J}{m^3}}\) | \(J-m^{-3}\) | \(1.435\;x\;10^{-36}\) \(J-m^{-3}\) |
| \(E_f\) | - | Fermi energy | \(lbf-ft\) | \(J\) | \(kg-m^2-s^{-2}\) | - |
| \(f_f\) | - | Fermi force | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(p_f\) | - | Fermi momentum | \(\large{\frac{lbm-ft}{sec}}\) | \(\large{\frac{kg-m}{s}}\) | \(kg-m-s^{-1}\) | - |
| \(r_f\) | - | Fermi repulsion | - | - | - | - |
| \(v_f\) | - | Fermi velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m-s^{-1}\) | - |
| \(h\) | - | film coefficient | \(\large{\frac{Btu}{ft^2-hr-F}}\) | \(\large{\frac{W}{m^2-K}}\) | \(W-m^{-2}-K^{-1}\) | - |
| \(h\) | - | film thickness | \(in\) | \(mm\) | \(mm\) | - |
| \(a_f\) | - | final acceleration | \(\large{\frac{ft}{sec^2}}\) | \(\large{\frac{m}{s^2}}\) | \(m-s^{-2}\) | - |
| \(\omega_f\) | omega | final angular velocity | \(\large{\frac{rad}{sec}}\) | \(\large{\frac{rad}{s}}\) | \(rad-s^{-1}\) | - |
| \(l_f\) | - | final length | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(x_f\) | - | final position | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(T_f\) | - | final temperature | \(F\) | \(C\) | \(x+273.15\;K\) | - |
| \(t_f\) | - | final time | \(sec\) | \(s\) | \(s\) | - |
| \(v_f\) | - | final velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m-s^{-1}\) | - |
| \(V_f\) | - | final volume | \(ft^3\) or \(in^3\) | \(m^3\) or \(mm^3\) | \(m^3\) or \(mm^3\) | - |
| \(\alpha\) | alpha | fine structure constant | dimensionless constant | dimensionless constant | dimensionless constant | \(7.297\;352\;5693\;x\;10^{-3}\) |
| \(\Delta U\) | - | first law of thermodynamics | - | - | - | - |
| \(Q\) | - | first moment of area | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(c_1\) | - | first radiation constant | - | \(\large{\frac{W}{m^2}}\) | \(W-m^{-2}\) | \(3.741\;771\;852...\;x\;10^{-16}\) \(\large{\frac{W}{m^2}}\) |
| \(FEM\) | - | fixed end moment | \(lbf-in\) | \(N-mm\) | \(N-mm\) | - |
| \(t_f\) | - | flange thickness | \(in\) | \(mm\) | \(mm\) | |
| \(FS\) | - | flash steam | \(\large{\frac{lbf}{in^2}}\) | \(\large{\frac{kg}{mm^2}}\) | \(kg-mm^{-2}\) | - |
| \(T\) | - | flight time | \(hr\) | \(hr\) | - | - |
| \(q\) | - | flow | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) | \(m^3-s^{-1}\) | - |
| \(C_v\), \(\;K_v\) | - | flow coefficient | dimensionless | dimensionless | dimensionless | - |
| \(Q\) | - | flow rate | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) | \(m^3-s^{-1}\) | - |
| \(Q\) | - | flow rate capacity | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) | \(m^3-s^{-1}\) | - |
| \(Q_a\) | - | flow rate of air | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) | \(m^3-s^{-1}\) | - |
| \(Q_s\) | - | flow rate of steam | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) | \(m^3-s^{-1}\) | - |
| \(Q_w\) | - | flow rate of water | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) | \(m^3-s^{-1}\) | - |
| \(Q\), \(\;V\) | - | flow velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m-s^{-1}\) | - |
| \(P_c\) | - | fluid critical pressure | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(\rho_f\) | rho | fluid density | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(p\) | - | fluid pressure at depth | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(h\) | - | fluid head | \(ft\) | \(m\) | \(m\) | - |
| \(\Delta E\) | - | fluid mehanical energy loss | \(lbf-ft\) | \(J\) | \(kg-m^2-s^{-2}\) | - |
| \(p\) | - | fluid pressure | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(p\) | - | fluid pressure at depth | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | |
| \(\xi\) | xi | fluid resistance coefficient | dimensionless | dimensionless | dimensionless | - |
| \(P_v\) | - | fluid vapor pressure | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(v\) | - | fluid velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m-s^{-1}\) | - |
| \(\Delta v_f\) | - | fluid velocity change | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m-s^{-1}\) | - |
| \( F\) | - | force | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(F_d\), \(\;\Delta F\) | delta | force differential | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(F\) | - | force exerted by contracting or stretching a material | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(F_a\) | - | force of air resistance or drag | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(P\) | - | force of impression | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(F\) | - | formality | - | - | - | - |
| \(FW\) | - | formula weight | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(Fo\) | - | Fourier number | dimensionless | dimensionless | dimensionless | - |
| \(g\) | - | Fourier's law | - | - | - | - |
| \(x\) | - | fraction | - | - | - | - |
| \(M\) | - | fraction moisture | dimensionless | dimensionless | dimensionless | - |
| \(d_{\infty}\) | - | free steam density | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(\rho_{\infty}\) | rho | free steam pressure | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(v_{\infty}\) | - | free steam velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m-s^{-1}\) | - |
| \(F\) | - | Fresnel number | dimensionless | dimensionless | dimensionless | - |
| \(f\), \(\;\nu\) | nu | frequency | \(Hz\) | \(Hz\) | \(s^{-1}\) | - |
| \(Q\) | - | fresh air introduction rate | - | - | - | - |
| \(f\) | - | friction | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(\mu\) | mu | friction coefficient | dimensionless | dimensionless | dimensionless | - |
| \(h_fd\) | friction discharge head | \(ft\) | \(m\) | \(m\) | - | |
| \(f\) | - | friction factor | dimensionless | dimensionless | dimensionless | - |
| \(F_f\) | - | friction force | - | - | - | - |
| \( FHP\) | - | friction horsepower | \(hp\) | \(hp\) | \(watt\) | - |
| \(FL\) | - | friction loss | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(\xi\), \(\;C\) | xi | friction loss coefficient | dimensionless | dimensionless | dimensionless | - |
| \( FP\) | - | friction pressure | - | - | - | - |
| \(f\) | - | fraction split | dimensionless | dimensionless | dimensionless | - |
| \(h_{fs}\) | friction suction head | - | - | - | - | |
| \(RA\) | - | fractional reduction in area | \(ft^2\) or \(in^2\) | \(m^2\) or \(mm^2\) | \(m^2\) or \(mm^2\) | - |
| \(F\) | - | Fresnel number | dimensionless | dimensionless | dimensionless | - |
| \(Fo\) | - | Fourier number | dimensionless | dimensionless | dimensionless | - |
| \(Fr\) | - | Froude number | dimensionless | dimensionless | dimensionless | - |
| \(FAR\) | - | fuel-air ratio | - | - | - | - |
| \(s'\) | - | fuel economy | \(\large{\frac{mi}{gal}}\) | \(\large{\frac{km}{L}}\) | \(km-L^{-1}\) | - |
| \(m_f\) | - | fuel mixture | - | - | - | - |
| \(FU\) | - | fuel utilization | - | - | - | - |
| \(f\) | - | function | - | - | - | - |
| Symbol | Greek Symbol | Definition | English | Metric | SI | Value |
