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Formula Symbols - E

Written by Jerry Ratzlaff on . Posted in Nomenclature & Symbols for Engineering, Mathematics, and Science

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E

SymbolGreek SymbolDefinitionUSMetricValue
    earth age constant constant \(1.4327\;x\;10^{17}\;s\)
    earth axial tilt constant constant \(0.407\;638\;19\;rad\)
    earth average lunar month constant constant \(2.551\;4430\;x\;10^6\;s\)
    earth core radius constant constant \(3.485\;x\;10^6\;m\)
    earth dry land surface area constant constant \(1.489\;40\;x\;10^{14}\;m^2\)
    earth equatorial surface gravity constant constant \(9.780\;327\;m\;s^{-2}\)
    earth equatorial radius constant constant \(6.3781\;x\;10^6\;m\)
    earth equatorial rotation speed constant constant \(465.1\;m\;s^{-1}\)
    earth escape velocity constant constant \(1.1186\;x\;10^4\;m\;s^{-1}\)
    earth mass constant constant \(5.9736\;x\;10^{24}\;kg\)
 \(g\)   earth mean density constant  constant  \(5.515\;x\;10^3\;kg\;m^{-3}\)
    earth mean surface pressure constant constant \(1.103\;25\;10^5\;kg\;m^{-1}\;s^{-2}\)
    earth mean radius constant constant \(6.3710\;x\;10^6\;m\)
    earth mean surface temperature constant constant \(287.2\;K\)
    earth molar mass constant constant constant \(0.001\;kg\;mol^{-1}\)
    earth polar radius constant constant \(6.3568\;x\;10^6\;m\)
    earth surface area constant constant \(5.100\;720\;x\;10^{14}\;m^2\)
    earth volume constant constant \(1.083\;21\;x\;10^{21}\;m^3\)
\(e\) - eccentricity in mm  -
\(Ec\) - Eckert number dimensionless dimensionless  -
\(I\) - effective line current \(A\) \(A\)  -
\(V\) - effective line voltage \(V\) \(V\)  -
\(m*_n\), \(\;m*_p\) - effective mass - -  -
\(E\), \(\;\xi\) xi effectiveness - -  -
\(\eta \) eta efficiency % %  -
\(\Theta_e\) Theta Einstein temperature - -  -
\(Ek\) - Ekman number dimensionless dimensionless  -
\(E\) - elastic - -  -
\(\lambda\) lambda elastic modulus \(lb\;/\;in^2 \;or\; psi\) \(Pa\)  -
\(\lambda_c\), \(\;E_c\) lambda elastic modulus of concrete \(lb\;/\;in^2 \;or\; psi\) \(Pa\) -
\(PE\), \(\;E_p\) - elastic potential energy \(ft-lbf\) \(J\)  -
\(S\) - elastic section modulus \(in^2\) \(mm^2\)  -
\(E\) - elasticity \(lb\;/\;in^2 \;or\; psi\) \(Pa\)  -
\(El\) - elasticity number dimensionless dimensionless  -
\(q\) - electric charge \(Ah\) \(C\)  -
\(F\) - electric capacitance \(C \;/\; V\) \(C \;/\; V\)  -
\(S\) - electric conductance \(A \;/\; V\) \(A \;/\; V\)  -
\(\rho_{ik}\) rho electric conductivity tensor - -  -
\(\varepsilon_0\) varepsilon electric constant constant constant \(8.8542\;x\;10^{-12}\;s^2\;/\;kg\;m\)
\(I\) - electric current - -  -
\(J\), \(\;j\) - electric current density - -  -
\(p\) - electric dipole moment - -  -
\(D\) - electric displacement - -  -
\(E\) - electric field - -  -
\(\psi\) psi electric flux - -  -
\(V\), \(\;\phi\) phi electric potential \(W \;/\; A\) \(W \;/\; A\)  -
\(U_e\) - electric potential energy \(ft-lbf\) \(J\)  -
\(\Omega\) Omega electric resistance \(V \;/\; A\) \(V \;/\; A\)  -
\(X_c\) - electric susceptibility - -  -
\(\sigma\) sigma electrical conductivity - -  -
\(R_e\) - electrical resistance \(\Omega\) \(\Omega\)  -
\(\rho \) rho electrical resistivity \(\Omega^{-in}\) \(\Omega^{-cm}\)  -
\(e\) - electron - -  -
\(E_{ea}\) - electron affinity - -  -
\(\frac {m_c}{m_{\alpha}}\)   electron-\(\alpha\)  particle mass ratio - -  -
    electron change / mas ratio constant constant \(-1.758\;820\;088\;x\;10^{11}\;kg^{-1}\;s\;A\)
\(w_{ce}\) - electron cyclotron circular frequency - -  -
\(\frac {m_e}{m_d}\) - electron-deuteron mass ratio - -  -
\(D_e\) - electron diffusion coefficient - -  -
\(a_{ge}\) - electron gravitational coupling constant dimensionless constant dimensionless constant \(2.40\;x\;10^{-43}\)
\(E_e\) - electron rest energy constant constant \(8.1871\;x\;10^{-14}\;kg\;m^2\;/\;s^2\)
\(g_e\) - electron g-factor dimensionless constant dimensionless constant \(-2.002\;319\;304\;362\;56\)
\(m_e\) - electron rest mass constant constant \(9.109\;383\;701\;x\;10^{-31}\;kg\)
\(M \left( e \right)\), \(\;M_e\) - electron molar mass - -  -
\(\frac {m_c}{m_{\mu}}\) mu electron-muon mass ratio - -  -
\(n_c\) - electron number density - -  -
\(g_\lambda\) lambda electron orbital g-factor dimensionless constant dimensionless constant \(0.993643364\)
\(O_e\) - electron outer shell multiplier dimensionless constant dimensionless constant \(2.138743820\)
\(K_e\) - electron partical wave center point dimensionless constant dimensionless constant \(10\)
\(w_{pe}\) - electron plasma circular frequency - -  -
\(\frac {m_c}{m_p}\) - electron-proton mass ratio dimensionless constant dimensionless constant \(5.446\;170\;2178\;x\;10^{-4}\)
\(r_e\) - electron radius constant constant \(2.8179\;x\;10^{-15}\;m\)
\(\frac {-e}{m_e}\) - electron specific charge - -  -
\(g_a\) - electron spin g-factor dimensionless constant dimensionless constant \(0.976448541\)
\(T_e\) - electron temperature - -  -
\(e\) - electronic charge - -  -
\(u \;or\; w\) - electromagnetic energy density - -  -
\(E\), \(\;\varepsilon\) varepsilon electromotive force (EMF) - -  -
\(F_e \) - electrostatic force - -  -
\(dl\), \(\;ds\) - element of path - -  -
\(e\), \(\;e_e\) - elementary change constant constant \(1.602\;176\;634\;x\;10^{-19}\;C\)
\(y\) - elevation \(ft\) \(m\)  -
\(y_i\) - elevation at inlet \(ft\) \(m\)  -
\(y_o\)  - elevation at outlet \(ft\) \(m\)  -
\(\Delta y\) Delta elevation differential \(ft\) \(m\)  -
\(E\) - emission rate \(lb \;/\; hr\) \(kg \;/\; hr\) -
\(\epsilon\) epsilon emissivity - -  -
\(E\) - emissive power \(Btu \;/\; hr-ft^2\) \(W \;/\; m^2\)  -
\(\gamma\) gamma empirical constant \(1\;/\; F\) \(1\;/\;C\)  -
\(\epsilon\) epsilon empirical loss coefficient dimensionless dimensionless  -
\(r\) - empirical rate - -  -
 \(E\), \(\;W\) - energy \(ft-lbf\) \(J\)  -
\(E\), \(\;W\) - energy \(Btu\) \(kJ\)  -
\(E\), \(\;W\) - energy \(HP-hr\) \(MJ\)  -
\(\Delta E\) - energy differential \(ft-lbf\) \(J\)  -
           
\(EER\) - energy efficiency ratio or rating \(Btu \;/\; W-hr\) -  -
\(\epsilon\) epsilon energy of particle - -  -
\(E_g\) - energy gap - -  -
\(EHP\), \(\;HP_e\) - engine horsepower \(hp\) \(hp\) -
\(RPM\) - engine speed rpm \(rad \;/\; s\)  -
\(H\) - enthalpy \(ft-lbf\) \(J\)  -
\(\large{ \partial H }\) partial enthalpy rate of change - - -
\(S\) - entropy \(ft-lbf \;/\; ^\circ F\) \(J\;/\;K\)  -
\(\Delta S\) Delta entropy differential \(ft-lbf \;/\; ^\circ F\) \(J\;/\;K\)  -
\(\phi\) phi entropy function \(ft-lbf \;/\; ^\circ F\) \(J\;/\;K\)  -
\(Eo\) - Eotvos number dimensionless dimensionless  -
\(K\) - equilibrium constant - -  -
\(EW\) - equivalent weight \(lbm\;/\;lbmol\) \(kg\;/\;kmol\)  -
\(n\), \(\;n_n\), \(\;n^{12}\) - electron number density - -  -
\(\gamma\) gamma empirical constant \(1 \;/\; F\) \(1 \;/\; C\)
 -
\(r\) - empirical rate constant \(1 \;/\; hr\) \(1 \;/\; s\)  -
\(Er\) - Ericksen number dimensionless dimensionless  -
\(v_e\) - escape velocity \(ft\;/\;sec\) \(m\;/\;s\)  -
\(A\) - estimated annual soil loss \(ft^3\) \(m^3\) -
\(A_e\), \(\;P_e\) - Ettinghausen coefficient - -  -
\(Eu\) - Euler number dimensionless constant dimensionless constant  \(2.718\;281\;828\;459...\)
\(\Delta h_f\) Delta evaporation enthalpy change - -  -
\(\Theta_r\) Theta Excess temperature coefficient dimensionless dimensionless  -
\(J\) - exchange integral  - -  -
\(Y\) - expansion coefficient - - -
\(Y\) - expansion factor dimensionless dimensionless  -
\(e\) - exponential constant - -  -
Symbol Greek Symbol Definition US Metric Value

 

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