Formula Symbols - M
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M
| Symbol | Greek Symbol | Definition | US | Metric | Value |
|---|---|---|---|---|---|
| \(m_e\) | - | electron (rest) | \(lbm\) | \(kg\) | - |
| \(Ma\) | - | Mach number | dimensionless | dimensionless | - |
| \(Mi\) | - | Machinability index | dimensionless | dimensionless | - |
| \(\Sigma\) | Sigma | macroscopic cross section | - | - | - |
| \(M\), \(\;m_i\) | - | magnetic | - | - | - |
| \(\mu_o\) | mu | magnetic constant | constant | constant | \(1.2566\;x\;10^{-6}\;kg\;/\;m\) |
| \(B\) | - | magnetic field | - | - | - |
| \(n_m\), \(\;\nu_m\) | nu | magnetic diffusivity | - | - | - |
| \(m\), \(\;\mu\) | mu | magnetic dipole moment | - | - | - |
| \(H\), \(\;\vec{H}\) | - | magnetic field | - | - | - |
| \(\phi_m\) | phi | magnetic flux | \(T\) | \(T\) | - |
| \(B\) | - | magnetic flux density | - | \(T\) | - |
| \(\Phi_o\) | Phi | magnetic flux quantum | constant | constant | \(2.067\;833\;758\;x\;10^{-15}\;kg\;m^2\;s^{-2}\;A^{-1}\) |
| \(F_m\) | - | magnetic force | \(lbf\) | \(N \;/\; a-m\) | - |
| \(B\), \(\;\vec{B}\) | - | magnetic induction | - | - | - |
| \(\mu\) | mu | magnetic moment of a particle | - | - | - |
| \(\mu\) | mu | magnetic permeability | - | - | - |
| \(U_m\) | - | magnetic potential difference | - | - | - |
| \(p_m\) | - | magnetic pressure | - | - | - |
| \(\beta\) | beta | magnetic pressure ratio | - | - | - |
| \(R_m\) | - | Magnetic Reynolds number | 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 | \(ft\) | \(m\) | - |
| \(v\) | - | Manning equation | \(ft\;/\;sec\) | \(m\;/\;s\) | - |
| \(n\) | - | Manning friction coefficient | - | - | - |
| \(n\) | - | Manning's roughness coefficient | dimensionless | dimensionless | - |
| \(Ma\) | - | Marangoni number | dimensionless | dimensionless | - |
| \(MS\), \(MOS\) | - | margin of safety | - | - | - |
| \(M\) | - | Markstein number | dimensionless | dimensionless | - |
| \(m\) | - | mass | \(lbm\) | \(kg\) | - |
| \(M\) | - | mass scale | - | - | - |
| \(\mu_m\) | mu | mass attenuation coefficient | - | - | - |
| \(\dot {m}_c\) | - | mass condensation rate | \(lbm\;/\;hr\) | \(kg\;/\;s\) | - |
| \(c\) | - | mass consentration | \(lbm\) | \(kg\) | - |
| \(\rho \) | rho | mass density | \(lb\;/\;ft^3\) | \(kg\;/\;m^3\) | - |
| \(D\), \(\;D_m\) | - | mass diffusivity | \(ft^2/sec\) | \(m^2\;/\;s\) | - |
| \(\Delta\) | Delta | mass excess | - | - | - |
| \(\dot {m}_f\) | - | mass flow rate | \(lbm\;/\;sec\) | \(kg\;/\;s\) | - |
| \(B\), \(\;\Gamma\) | Gamma | mass flow rate per unit area | \(lbm\;/\;hr-ft^2\) | \(kg\;/\;s-m^2\) | - |
| \(w\) | - | mass fraction | - | - | - |
| \(m\), \(\;\dot {m}\) | - | mass leak rate | \(lbm\;/\;sec\) | \(kg\;/\;s\) | - |
| \(I\) | - | mass moments of inertia | \(lbm-ft^2\) | \(kg-m^2\) | - |
| \(A\) | - | mass number | - | - | - |
| \(m_l\) | - | mass of liquid | \(lb\) | \(gr\) | - |
| \(\mu\) | mu | mass of molecule | - | \(g/mol\) | - |
| \(m_s\) | - | mass of solid | \(lb\) | \(gr\) | - |
| \(K\), \(\;k\) | - | mass transfer coefficient | \(ft/sec\) | \(m/s\) | - |
| \(\dot {m}_t\) | - | mass transfer rate | \(lbm\;/\;sec\) | \(kg\;/\;s\) | - |
| \(G\) | - | mass velocity | \(lbm\;/\;sec\) | \(kg\;/\;s\) | - |
| \(J\) | - | Massieu function | - | - | - |
| \(D\) | - | material density | \(g \;/\; cm^3\) | \(kg \;/\; m^3\) | - |
| \(K_{cE}\) | - | material factor for wood column design | - | - | - |
| \(S_f\) | - | maximum allowable stress | \(lb\;/\;in^2 \;or\; psi\) | \(Pa\) | - |
| \(M\) | - | maximum bending moment | \(lbf-in\) | \(N-mm\) | - |
| \(\Delta_{max}\) | Delta | maximum calculated beam deflection | \(in\) | \(mm\) | - |
| \(P_{max}\) | maximum load | - | - | - | |
| \(M_u\) | - | maximum moment from factored loads for LRFD beam design | \(lbf-ft\) | \(N-m\) | - |
| \(\tau\) | tau | maximum shear stress | \(lb\;/\;in^2 \;or\; psi\) | \(kg \;/\; cm^2\) | - |
| \(S\) | - | maximum soil moisture retention after runoff begins | \(in\) | \(mm\) | - |
| \(H_{sp}\) | - | maximum surge pressure head in a length of pipe | \(lb\;/\;ft^2 \;or\; psi\) | \(Pa\) | - |
| \(P_{spf}\) | - | maximum surge pressure for a fluid | \(lb\;/\;ft^2 \;or\; psi\) | \(Pa\) | - |
| \(L_c\) | - | maximum unbraced length of a steel beam in ASD design for max. allowed bending stress | \(in \;or\; ft\) | \(mm \;or\;m\) | - |
| \(L_p\) | - | maximum unbraced length of a steel beam in LRFD design for full plastic flexural strength | \(in \;or\; ft\) | \(mm \;or\;m\) | - |
| \(L_r\) | - | maximum unbraced length of a steel beam in LRFD design for inelastic strength | \(in \;or\; ft\) | \(mm \;or\;m\) | - |
| \(L_u\) | - | maximum unbraced length of a steel beam in ASD design for reduced allowed bending stress | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \(m\), \(\;\mu\) | mu | mean | - | - | - |
| \(h_m\) | - | mean depth | \(ft\) | \(m\) | - |
| \(v\) | - | mean flow velocity | \(ft\;/\;sec\) | \(m\;/\;s\) | - |
| \(l\), \(\;\lambda\) | lambda | mean free path | \(ft\) | \(m\) | - |
| \(\tau\), \(\;\tau_m\) | tau | mean life | - | - | - |
| \(E_cm\) | - | mean modulus of elasticity of concrete | \(lb\;/\;ft^2 \;or\; psi\) | \(Pa\) | - |
| \(E_cm28\) | - | mean modulus of elasticity of concrete at 28 days | \(lb\;/\;ft^2 \;or\; psi\) | \(Pa\) | - |
| \(E_cmt\) | - | mean modulus of elasticity of concrete at age t | \(lb\;/\;ft^2 \;or\; psi\) | \(Pa\) | - |
| \(E_cmto\) | - | mean modulus of elasticity of concrete when loading starts at age t_o | \(lb\;/\;ft^2 \;or\; psi\) | \(Pa\) | - |
| \(v_m\) | - | mean velocity | \(ft\;/\;sec\) | \(m\;/\;s\) | - |
| \(h\) | - | mean water depth | \(ft\) | \(m\) | - |
| \(ME\) | - | mechanical efficiency | - | - | - |
| \(ME\) | - | mechanical energy | \(ft-lbf\) | \(J\) | - |
| \(W\) | - | mechanical work | - | \(J\) | - |
| \(\rho_m\) | rho | media density | \(lb\;/\;ft^3\) | \(kg\;/\;m^3\) | - |
| \(m\) | - | midordinate | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \(Z_w\) | - | metal removal rate | \(ft^3\;/\;min\) | \(m_3\;/\;s\) | - |
| milky way galaxy diameter | constant | constant | \(1.04\;x\;10^{21}\;m\) | ||
| milky way galaxy distance to center | constant | constant | \(2.57\;x\;10^{20}\;m\) | ||
| milky way galaxy distance to closest neighbouring system | constant | constant | \(3.970\;x\;10^{16}\;m\) | ||
| milky way galaxy mass | constant | constant | \(2.50\;x\;10^{42}\;kg\) | ||
| milky way galaxy number of stars | dimensionless constant | dimensionless constant | \(3.00\;x\;10^{11}\) | ||
| milky way galaxy oldest star known | constant | constant | \(4.156\;x\;10^{17}\;s\) | ||
| milky way galaxy orbital speed rotation around center | constant | constant | \(2.20\;x\;10^5\;m\;s^{-1}\) | ||
| milky way galaxy thickness | constant | constant | \(1.00\;x\;10^{19}\;m\) | ||
| \(I_{min}\) | - | minimum moment of inertia of \(I_x\) and \(I_y\) | \(in \;or\; ft\) | \(mm \;or\; m\) | - |
| \(h_{l-minor}\) | - | minor head loss | \(ft\) | \(m\) | - |
| \(K\) | - | minor loss coefficient | - | - | - |
| \(K\) | - | 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 | \(lb\;/\;ft^2 \;or\; psi\) | \(Pa\) | - |
| \(E\) | - | modulus of elasticity earthquake load for LRFD design | \(psi\) | \(kPa\) | - |
| \(U_r\) | - | modulus of resilience | \(lbf\;/\;in^2\) | \(MPa\) | - |
| \(G\), \(\;\mu\) | mu | modulus of rigidity | \(Pa\) | \(Pa\) | - |
| \(G\) | - | modulus of torsional | \(Pa\) | \(Pa\) | - |
| \(U_t\) | - | modulus of toughness | \(lbf\;/\;in^2\) | \(MPa\) | - |
| \(n\) | - | modular ratio | - | - | - |
| \(m\) | - | module | - | \(mm\) | - |
| \(MC\) | - | moisture content | - | - | - |
| \(m\) | - | molality | \(lb\;/\;mol\) | \(kg\;/\;mol\) | - |
| \(M\) | - | molar concentration | \(lbmol\;/\;ft^3\) | \(kmol\;/\;m^3\) | - |
| \(H\) | - | molar enthalpy | \(Btu\;/\;lbmol\) | \(kJ\;/\;kmol \) | - |
| \(S\) | - | molar entropy | \(Btu\;/\;lbmol-^\circ R\) | \(kJ\;/\;kmol-K\) | - |
| \(x\) | - | molar fraction | - | - | - |
| \(M\) | - | molar gas | \(lb \;/\; mol\) | \(kg \;/\; mol\) | - |
| \(R\) | - | molar gas constant | constant | constant | \(8.314\;462\;618...\;J\;mol^{-1}\;K^{-1}\) |
| \(c_m\) | - | molar heat | \(lb\;/\;mol\) | \(kg\;/\;mol\) | - |
| \(U\) | - | molar internal energy | \(Btu\;/\;lbmol\) | \(kJ\;/\;kmol\) | - |
| \(M\) | - | molar mass of gas | - | - | - |
| \(M\) | - | molar mass | \(lb\;/\;mol\) | \(kg\;/\;mol\) | - |
| \(M_u\) | - | molar mass constant | constant | constant | \(0.001\;kg\;mol^{-1}\) |
| \(M(^12 C)\) | - | molar mass of carbon-12 | constant | constant | \(11.999\;999\;9958\;x\;10^{-3}\;kg\;mol^{-1}\) |
| \(M_u\) | - | molar mass constant | constant | constant | \(0.999\;999\;999\;65\;x\;10^{-3}\;kg\;mol^{-1}\) |
| \(N_a h\) | - | molar Planck constant | constant | constant | \(3.990\;312\;712\;...\;x\;10^{-10}\;J\;Hz^{-1}\;mol^{-1}\) |
| \(r\) | - | molar ratio of solution | - | - | - |
| \(C\) | - | molar specific heat |
\(Btu\;/\;lbmol-^\circ F\) |
\(kJ\;/\;kmol-K\) | - |
| \(V\) | - | molar specific volume | \(ft^3\;/\;lbmol\) | \(m^3\;/\;kmol\) | - |
| \(V_m\) | - | molar volume | \(ft^3\;/\;mol\) | \(m^3\;/\;mol\) | - |
| \(V_m\) | - | molar volume of ideal gas | constant | constant | \(22.413\;968\;x\;10^{-3}\;m^3\;mol^{-1}\) |
| \(M\) | - | molarity | - | \(mol\;/\;l\) | - |
| \(m\) | - | molarity of solution | - | - | - |
| \(n\) | - | mole | - | - | - |
| \(\chi \) | chi | mole fraction | \(mol\) | \(mol\) | - |
| \(MW\) | - | molecular weight | \(lbm\;/\;lbmol\) | \(kg\;/\;kmol\) | - |
| \(M\) | - | moment | \(lbf \;/\; sec\) | \(kg-m \;/\; s\) | - |
| \(M\) | - | moment about the neuteal axis | - | - | - |
| \(M\) | - | moment of force | \(lbf-ft\) | \(N-m\) | - |
| \(I\), \(\;J\) | - | moment of inertia | \(lbm-ft2\) | \(kg-m^2\) | - |
| \(I_{cm}\) | - | moment of inertia center of mass | \(lbm-ft2\) | \(kg-m^2\) | - |
| \(I_c\), \(\;\overline{I}\) | - | moment of inertia about the centroid | \(in^4\) | \(mm^4\) | - |
| \(I_x\) | - | moment of inertia with respect to an x-axis | \(in^4\) | \(mm^4\) | - |
| \(I_y\) | - | moment of inertia with respect to an y-axis | \(in^4\) | \(mm^4\) | - |
| \(p\), \(\;\rho\) | rho | momentum | \(lbm-ft\;/\;sec\) | \(kg-m\;/\;s\) | - |
| \(M\) | - | moment of mass | \(lbf\) | \(kg-m\) | - |
| \(Mo\) | - | Morton number | dimensionless | dimensionless | - |
| \(\eta_m\) | eta | motor efficiency | dimensionless | dimensionless | - |
| \(MHP\), \(HP_m\) | - | motor horsepower | \(hp\) | - | - |
| \(M\) | - | mutual inductance | - | - | - |
| Symbol | Greek Symbol | Definition | US | Metric | Value |
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