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"M" 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 |
| \(Ma\) | - | Mach number | dimensionless | dimensionless | dimensionless | - |
| \(Mi\) | - | Machinability index | dimensionless | dimensionless | dimensionless | - |
| \(\Sigma\) | Sigma | macroscopic cross section | - | - | - | - |
| \(M\), \(\;m_i\) | - | magnetic | - | - | - | - |
| \(\mu_o\) | mu | magnetic constant | \(\large{\frac{H}{ft}}\) | \(\large{\frac{H}{m}}\) | \(H-m^{-1}\) | \(1.2566\;x\;10^{-6}\) \(\large{\frac{H}{m}}\) |
| \(n_m\), \(\;\nu_m\) | nu | magnetic diffusivity | \(\large{\frac{ft^2}{sec}}\) | \(\large{\frac{m^2}{s}}\) | \(m^2-s^{-1}\) | - |
| \(m\), \(\;\mu\) | mu | magnetic dipole moment | - | - | - | - |
| \(B\) | - | magnetic field | \(T\) | \(T\) | \(kg-s^{-2}-A^{-1}\) | - |
| \(H\), \(\;\vec{H}\) | - | magnetic field strength | \(\large{\frac{A}{ft}}\) | \(\large{\frac{A}{m}}\) | \(A-m^{-1}\) | - |
| \(\phi_B\), \(\;\phi_m\) | phi | magnetic flux | \(\large{\frac{Wb}{in^2}}\) | \(\large{\frac{Wb}{mm^2}}\) | \(Wb-mm^{-2}\) | - |
| \(B\) | - | magnetic flux density | \(\large{\frac{Wb}{ft^2}}\) | \(\large{\frac{Wb}{m^2}}\) | \(Wb-m^{-2}\) | - |
| \(\Phi_o\) | Phi | magnetic flux quantum | \(\large{\frac{V}{sec}}\) | \(Wb\) | \(kg-m^2-s^{-2}-A^{-1}\) | \(2.067\;833\;758\;x\;10^{-15}\) \(Wb\) |
| \(F_m\) | - | magnetic force | \(\large{\frac{lbm-ft}{sec^2}}\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(F_m\) | - | magnetic force between parallel conductors | \(\large{\frac{lbm-ft}{sec^2}}\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(B\), \(\;\vec{B}\) | - | magnetic induction | \(T\) | \(T\) | \(kg-s^{-2}-A^{-1}\) | - |
| \(\mu\) | mu | magnetic moment of a particle | - | - | - | - |
| \(\mu\) | mu | magnetic permeability | \(\large{\frac{H}{ft}}\) | \(\large{\frac{H}{m}}\) | \(H-m^{-1}\) | - |
| \(\mu_0\) | mu | magnetic permeability vacuum | - | \(\large{\frac{N}{A^2}}\) | \(N-A^{-2}\) | \(1.256\;637\;0614\;x\;10^{-6}\) \(\large{\frac{N}{A^2}}\) |
| \(U_m\) | - | magnetic potential difference | - | - | - | - |
| \(p_m\) | - | magnetic pressure | \(\large{\frac{lbm}{ft-sec^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(\beta\) | beta | magnetic pressure ratio | dimensionless | dimensionless | dimensionless | - |
| \(R_m\) | - | Magnetic Reynolds number | dimensionless | dimensionless | dimensionless | - |
| \(X\) | - | magnetic susceptibility | - | - | - | - |
| \(A\) | - | magnetic vector potential | - | - | - | - |
| \(F_m\) | - | magnetomotive force | - | - | - | - |
| \(M\) | - | magnetization | - | - | - | - |
| \(M\) | - | magnification | - | - | - | - |
| \(MF\) | magnification factor | - | - | - | - | |
| \(h_{l-major}\) | - | major head loss | \(ft\) | \(m\) | \(m\) | - |
| \(v\) | - | Manning equation | - | - | - | - |
| \(n\) | - | Manning friction coefficient | - | - | - | - |
| \(n\) | - | Manning's roughness coefficient | dimensionless | dimensionless | dimensionless | - |
| \(Ma\) | - | Marangoni number | dimensionless | dimensionless | dimensionless | - |
| \(MS\), \(MOS\) | - | margin of safety | dimensionless | dimensionless | dimensionless | - |
| \(M\) | - | Markstein number | dimensionless | dimensionless | dimensionless | - |
| \(m\) | - | mass | \(lbm\) | \(kg\) | \(kg\) | - |
| \(M\) | - | mass scale | - | - | - | - |
| \(\mu_m\) | mu | mass attenuation coefficient | - | - | - | - |
| \(\dot {m}_c\) | - | mass condensation rate | - | - | - | - |
| \(c\) | - | mass consentration | \(lbm\) | \(kg\) | \(kg\) | - |
| \(\rho \) | rho | mass density | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(D\), \(\;D_m\) | - | mass diffusivity | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) | \(m^3-s^{-1}\) | - |
| \(\Delta\) | Delta | mass excess | - | - | - | - |
| \(\dot {m}_f\) | - | mass flow rate | \(\large{\frac{lbm}{sec}}\) | \(\large{\frac{kg}{s}}\) | \(kg-s^{-1}\) | - |
| \(B\), \(\;\Gamma\) | Gamma | mass flow rate per unit area | \(\large{\frac{lbm}{ft^2-sec}}\) | \(\large{\frac{kg}{m^2-s}}\) | \(kg-m^{-2}-s^{-1}\) | - |
| \(w\) | - | mass fraction | - | - | - | - |
| \(m\), \(\;\dot {m}\) | - | mass leak rate | \(\large{\frac{lbm}{sec}}\) | \(\large{\frac{kg}{s}}\) | \(kg-s^{-1}\) | - |
| \(M\), \(\;\vec{M}\) | - | mass magnetization | \(\large{\frac{A-ft^2}{lbm}}\) | \(\large{\frac{A-m^2}{kg}}\) | \(A-m^2-kg^{-1}\) | - |
| \(I\) | - | mass moments of inertia | \(lbm-ft^2\) | \(kg-m^2\) | \(kg-m^2\) | - |
| \(A\) | - | mass number | - | - | - | - |
| \(m_da\) | - | mass of dry air | \(lbm\) | \(kg\) | \(kg\) | - |
| \(m_ds\) | - | mass of dry soil | \(lbm\) | \(kg\) | \(kg\) | - |
| \(m_e\) | - | mass of earth | \(lbm\) | \(kg\) | \(kg\) | - |
| \(m_l\) | - | mass of liquid | \(lbm\) | \(kg\) | \(kg\) | - |
| \(\mu\) | mu | mass of molecule | \(\large{\frac{oz}{mol}}\) | \(\large{\frac{g}{mol}}\) | \(g-mol^{-1}\) | - |
| \(m_s\) | - | mass of solid | \(lbm\) | \(kg\) | \(kg\) | - |
| \(m_w\) | - | mass of water | \(lbm\) | \(kg\) | \(kg\) | - |
| \(m_wv\) | - | mass of water vapor | \(lbm\) | \(kg\) | \(kg\) | - |
| \(K\), \(\;k\) | - | mass transfer coefficient | dimensionless | dimensionless | dimensionless | - |
| \(\dot {m}_t\) | - | mass transfer rate | \(\large{\frac{lbm}{sec}}\) | \(\large{\frac{kg}{s}}\) | \(kg-s^{-1}\) | - |
| \(G\) | - | mass velocity | - | - | - | - |
| \(J\) | - | Massieu function | - | - | - | - |
| \(D\) | - | material density | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(K_{cE}\) | - | material factor for wood column design | - | - | - | - |
| \(S_f\) | - | maximum allowable stress | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(S\) | - | maximum allowable tensile stress | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(M\) | - | maximum bending moment | \(lbf-in\) | \(N-mm\) | \(N-mm\) | - |
| \(\Delta_{max}\) | Delta | maximum calculated beam deflection | \(in\) | \(mm\) | \(mm\) | - |
| \(h_{max}\) | - | maximum height of a projectile | \(ft\) | \(m\) | \(m\) | - |
| \(P_{max}\) | maximum load | - | - | - | - | |
| \(M_u\) | - | maximum moment from factored loads for LRFD beam design | \(lbf-ft\) | \(N-m\) | \(kg-m^2-s^{-2}\) | - |
| \(V\) | - | maximum shear force | \(lbf\) | \(N\) | \(kg-m-s^{-2}\) | - |
| \(\tau\) | tau | maximum shear stress | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(S\) | - | maximum soil moisture retention after runoff begins | - | - | - | - |
| \(H_{sp}\) | - | maximum surge pressure head in a length of pipe | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(P_{spf}\) | - | maximum surge pressure for a fluid | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(m\), \(\;\mu\) | mu | mean | - | - | - | - |
| \(D\) | - | mean coil diameter | \(in\) | \(mm\) | \(mm\) | - |
| \(h_m\) | - | mean depth | \(in\) | \(mm\) | \(mm\) | - |
| \(MEP\) | - | mean effective pressure | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(v\) | - | mean flow velocity | - | - | - | - |
| \(l\), \(\;\lambda\) | lambda | mean free path | \(ft\) or \(in\) | \(m\) or \(mm\) | \(m\) or \(mm\) | - |
| \(\tau\), \(\;\tau_m\) | tau | mean life | - | - | - | - |
| \(E_cm\) | - | mean modulus of elasticity of concrete | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(E_cm28\) | - | mean modulus of elasticity of concrete at 28 days | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(E_cmt\) | - | mean modulus of elasticity of concrete at age t | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(E_cmto\) | - | mean modulus of elasticity of concrete when loading starts at age t_o | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(v_m\) | - | mean velocity | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) | \(m-s^{-1}\) | - |
| \(h\) | - | mean water depth | \(ft\) | \(m\) | \(m\) | - |
| \(M\) | - | mechanical advantage | dimensionless | dimensionless | dimensionless | - |
| \(ME\) | - | mechanical efficiency | dimensionless | dimensionless | dimensionless | - |
| \(ME\) | - | mechanical energy | \(lbf-ft\) | \(J\) | \(kg-m^2-s^{-2}\) | - |
| \(W\) | - | mechanical work | - | - | - | - |
| \(\rho_m\) | rho | media density | \(\large{\frac{lbm}{ft^3}}\) | \(\large{\frac{kg}{m^3}}\) | \(kg-m^{-3}\) | - |
| \(MP\) | - | melting point | \(F\) | \(C\) | \(x+273.15\;K\) | |
| \(Z_w\) | - | metal removal rate | \(\large{\frac{ft^3}{min}}\) | \(\large{\frac{m^3}{s}}\) | \(m^3-s^{-1}\) | - |
| \(m\) | - | midordinate | - | - | - | - |
| \(I_{min}\) | - | minimum moment of inertia of \(I_x\) and \(I_y\) | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(h_{l-minor}\) | - | minor head loss | \(ft\) | \(m\) | \(m\) | - |
| \(K\) | - | minor loss coefficient | dimensionless | dimensionless | dimensionless | - |
| \(K\) | - | mixing factor | - | - | - | - |
| \(\mu\), \(\;\mu_n\), \(\;\mu_p\) | mu | mobility | - | - | - | - |
| \(b\) | - | mobility ratio | - | - | - | - |
| \(C_m\) | - | modification factor for combined stress in steel design | - | - | - | - |
| \(\lambda\), \(\;E\) | lambda | modulus of elasticity | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(E_c\) | - | modulus of elasticity of concrete | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(E_s\) | - | modulus of elasticity of steel | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(E\) | - | modulus of elasticity earthquake load for LRFD design | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(U_r\) | - | modulus of resilience | \(lbf\;/\;in^2\) | \(Pa\) | \(kg-m^{-1}-s^{-2}\) | - |
| \(G\), \(\;\mu\) | mu | modulus of rigidity | \(\large{\frac{lbf}{in^2}}\) | \(Pa\) | \(N-\)kg-m^{-1}-s^{-2}\(^{-2}\) | - |
| \(G\) | - | modulus of torsional | - | - | - | - |
| \(U_t\) | - | modulus of toughness | - | - | - | - |
| \(n\) | - | modular ratio | dimensionless | dimensionless | dimensionless | - |
| \(m\) | - | module | - | - | - | - |
| \(MC\) | - | moisture content | dimensionless | dimensionless | dimensionless | - |
| \(\gamma_m\) | gamma | moisture unit weight | \(\large{ \frac{lbm}{ft^3} }\) | \(\large{ \frac{N}{m^3} }\) | \(N-m^{-3}\) | - |
| \(M\) | - | molar concentration | \(\large{\frac{lbmol}{ft^3}}\) | \(\large{\frac{kmol}{m^3}}\) | \(kmol-m^{-3}\) | - |
| \(H\) | - | molar enthalpy | \(\large{\frac{Btu}{lbmol}}\) | \(\large{\frac{kJ}{kmol}}\) | \(kJ-kmol^{-1}\) | - |
| \(S\) | - | molar entropy | \(\large{\frac{Btu}{lbmol-R}}|\) | \(\large{\frac{kJ}{kmol-K}}\) | \(kJ-kmol^{-1}-K^{-1}\) | - |
| \(x\) | - | molar fraction | dimensionless | dimensionless | dimensionless | - |
| \(M\) | - | molar gas | \(ft^3\) | \(m^3\) | \(m^3\) | - |
| \(R\) | - | molar gas constant | \(\large{ \frac{lbf-ft}{lbmol-R} }\) | \(\large{ \frac{J}{kmol-K} }\) | \(J-kmol^{-1}-K^{-1}\) | \(8.314\;462\;618\;153\;24\) \(\large{ \frac{J}{kmol-K} }\) |
| \(c_m\) | - | molar heat | \(\large{\frac{Btu}{lbmol}}\) | \(\large{\frac{kJ}{kmol}}\) | \(kJ-kmol^{-1}\) | - |
| \(U\) | - | molar internal energy | \(\large{\frac{Btu}{lbmol}}\) | \(\large{\frac{kJ}{kmol}}\) | \(kJ-kmol^{-1}\) | - |
| \(M\) | - | molar mass | \(\large{\frac{lbm}{mol}}\) | \(\large{\frac{kg}{mol}}\) | \(kg-mol^{-1}\) | \(0.999\;999\;999\;65\;(30)\;x\;10^{-3}\) \(\large{\frac{g}{mol}}\) |
| \(M_u\) | - | molar mass constant | \(\large{\frac{lbm}{mol}}\) | \(\large{\frac{kg}{mol}}\) | \(kg-mol^{-1}\) | \(0.999\;999\;999\;65\;(30)\;x\;10^{-3}\) \(\large{\frac{g}{mol^{-1}}}\) |
| \(M(^12 C)\) | - | molar mass of carbon-12 | \(\large{\frac{lbm}{mol}}\) | \(\large{\frac{kg}{mol}}\) | \(kg-mol^{-1}\) | \(11.999\;999\;9958 x 10^{-3}\) \(\large{\frac{g}{mol^{-1}}}\) |
| \(M\) | - | molar mass of gas | \(\large{\frac{lbm}{mol}}\) | \(\large{\frac{kg}{mol}}\) | \(kg-mol^{-1}\) | - |
| \(N_a h\) | - | molar Planck constant | \(\large{\frac{lbf-ft}{sec}}\) | \(J-s\) | \(kg-m^2-s^{-1}\) | \(6.626\;070\;15...\;x\;10^{-34}\) \(J-s\) |
| \(r\) | - | molar ratio of solution | - | - | - | - |
| \(C\) | molar specific heat | \(\large{\frac{Btu}{lbmol-F}}\) | \(\large{\frac{kJ}{kmol-K}}\) | \(kJ-kmol^{-1}-K^{-1}\) | - | |
| \(V\) | - | molar specific volume | \(\large{\frac{ft^3}{lbmol}}\) | \(\large{\frac{m^3}{kmol}}\) | \(m^3-kmol^{-1}\) | - |
| \(V_m\) | - | molar volume | \(\large{\frac{ft^3}{mol}}\) | \(\large{\frac{m^3}{mol}}\) | \(m^3-mol^{-1}\) | - |
| \(V_m\) | - | molar volume of ideal gas | \(\large{\frac{ft^3}{mol}}\) | \(\large{\frac{m^3}{mol}}\) | \(m^3-mol^{-1}\) | \(0.022\;413\;969\;545\;014...\) \(\large{\frac{m^3}{mol}}\) at \(0\;C\) |
| \(M\) | - | molarity | \(\large{\frac{mol}{gal}}\) | \(\large{\frac{mol}{L}}\) | \(mol-L^{-1}\) | - |
| \(m\) | - | molarity of solution | - | - | - | - |
| \(n\) | - | mole | \(mol\) | \(mol\) | \(mol\) | \(6.022\;140\;76\;x\;10^{23}\) \(mol\) |
| \(\chi \) | chi | mole fraction | dimensionless | dimensionless | dimensionless | - |
| \(n\) | - | moles of solution | \(mol\) | \(mol\) | \(mol\) | - |
| \(MW\) | - | molecular weight | \(\large{\frac{lbm}{lbmol}}\) | \(\large{\frac{kg}{kmol}}\) | \(kg-kmol^{-1}\) | - |
| \(M\) | - | moment | \(\large{\frac{lbf}{sec}}\) | \(\large{\frac{kg-m}{s}}\) | \(kg-m-s^{-1}\) | - |
| \(M\) | - | moment about the neuteal axis | \(\large{\frac{lbf}{sec}}\) | \(\large{\frac{kg-m}{s}}\) | \(kg-m-s^{-1}\) | - |
| \(M\) | - | moment of force | \(lbf-ft\) | \(N-m\) | \(kg-m^2-s^{-2}\) | - |
| \(I\), \(\;J\) | - | moment of inertia | \(\large{\frac{lbm}{ft^2-sec}}\) | \(\large{\frac{kg}{m^2}}\) | \(kg-m^{-2}\) | - |
| \(I_{cm}\) | - | moment of inertia center of mass | \(\large{\frac{lbm}{ft^2-sec}}\) | \(\large{\frac{kg}{m^2}}\) | \(kg-m^{-2}\) | - |
| \(I_c\), \(\;\overline{I}\) | - | moment of inertia about the centroid | \(\large{\frac{lbm}{ft^2-sec}}\) | \(\large{\frac{kg}{m^2}}\) | \(kg-m^{-2}\) | - |
| \(I_x\) | - | moment of inertia with respect to an x-axis | \(\large{\frac{lbm}{ft^2-sec}}\) | \(\large{\frac{kg}{m^2}}\) | \(kg-m^{-2}\) | - |
| \(I_y\) | - | moment of inertia with respect to an y-axis | \(\large{\frac{lbm}{ft^2-sec}}\) | \(\large{\frac{kg}{m^2}}\) | \(kg-m^{-2}\) | - |
| \(p\) | - | momentum | \(\large{\frac{lbm-ft}{sec}}\) | \(\large{\frac{kg-m}{s}}\) | \(kg-m-s^{-1}\) | - |
| \(p\) | - | momentum change in velocity | \(\large{\frac{lbm-ft}{sec}}\) | \(\large{\frac{kg-m}{s}}\) | \(kg-m-s^{-1}\) | - |
| \(\Delta p\) | - | momentum differential | \(\large{\frac{lbm-ft}{sec}}\) | \(\large{\frac{kg-m}{s}}\) | \(kg-m-s^{-1}\) | - |
| \(I\) | - | moment of inertia of a circle | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(I\) | - | moment of inertia of a cube | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(I\) | - | moment of inertia of a cylinder | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(I\) | - | moment of inertia of a mass | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(I\) | - | moment of inertia of a quarter circle | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(I\) | - | moment of inertia of a rectangle | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(I\) | - | moment of inertia of a semicircle | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(I\) | - | moment of inertia of a sphere | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(I\) | - | moment of inertia of a thin rod | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(I\) | - | moment of inertia of a triangle | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(I\) | - | moment of inertia of a annulus | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(I\) | - | moment of inertia of a ellipse | \(in^4\) | \(mm^4\) | \(mm^4\) | - |
| \(M\) | - | moment of mass | \(\large{\frac{lbm-ft}{sec}}\) | \(\large{\frac{kg-m}{s}}\) | \(kg-m-s^{-1}\) | - |
| \(Mo\) | - | Morton number | dimensionless | dimensionless | dimensionless | - |
| \(m\) | - | motion | \(ft\) | \(m\) | \(m\) | - |
| \(\eta_m\) | eta | motor efficiency | dimensionless | dimensionless | dimensionless | - |
| \(MHP\), \(HP_m\) | - | motor horsepower | \(\large{\frac{lbf-ft}{sec}}\) | \(\large{\frac{Btu}{s}}\) | \(Btu-s^{-1}\) | - |
| \(M\) | - | mutual inductance | - | - | - | - |
| Symbol | Greek Symbol | Definition | English | Metric | SI | Value |
