Formula Symbols - E

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

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Formula Symbols

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E

SymbolGreek SymbolDefinitionEnglishMetricSIValue
 -  - earth age \(sec\) \(s\) \(s\) \(1.4327\;(14)\;x\;10^{17}\) \(s\)
 -  - earth axial tilt \(deg\) \(rad\) \(rad\) \(0.407\;638\;19\) \(rad\)
 -  - earth average lunar month \(sec\) \(s\) \(s\) \(2.551\;4430\;(5)\;x\;10^{6}\)
 -  - earth core radius \(ft\) \(m\) \(m\) \(3.485\;x\;10^6\) \(m\)
 -  - earth dry land surface area \(ft^2\) \(m^2\) \(m^2\) \(1.489\;40\;x\;10^{14}\) \(m^2\)
 -  - earth equatorial surface gravity \(\large{\frac{ft}{sec^2}}\) \(\large{\frac{m}{s^2}}\) \(m-s^{-2}\) \(9.780\;327\) \(\large{\frac{m}{s^2}}\)
 -  - earth equatorial radius \(ft\) \(m\) \(m\) \(6.3781\;x\;10^6\) \(m\)
 -  - earth equatorial rotation speed \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{s}}\) \(m-s^{-1}\) \(465.1\) \(\large{\frac{m}{s}}\)
 -  - earth escape velocity \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{s}}\) \(m-s^{-1}\) \(1.1186\;x\;10^4\) \(\large{\frac{m}{s}}\)
 - - earth mass \(lbm\) \(kg\) \(kg\) \(5.9736\;x\;10^{24}\) \(kg\)
-  - earth mean density \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\)  \(kg-m^{-3}\) \(5.515\;x\;10^3\) \(\large{\frac{kg}{m^3}}\)
- - earth mean orbit velocity \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{s}}\) \(m-s^{-1}\) \(2.9780\;10^4\) \(\large{\frac{m}{s}}\)
 -  - earth mean surface pressure \(\large{\frac{lbf}{in^2}}\) \(\large{\frac{kg}{m-s^2}}\)  \(kg-m^{-1}-s^{-2}\) \(1.103\;25\;10^5\) \(\large{\frac{kg}{m-s^2}}\)
 -  - earth mean radius \(ft\) \(m\) \(m\) \(6.3710\;x\;10^6\) \(m\)
 -  - earth mean surface temperature \(F\) \(K\) \(x-273.15\;C\) -
 -  - earth molar mass constant \(\large{\frac{lbm}{mol}}\) \(\large{\frac{kg}{mol}}\) \(kg-mol^{-1}\) \(0.001\) \(\large{\frac{kg}{mol}}\)
 -  - earth polar radius \(ft\) \(m\) \(m\) \(6.3568\;x\;10^6\) \(m\)
- - earth semi-major orbital axis \(ft\) \(m\) \(m\) \(1.495\;982\;61\;10^{11}\) \(m\)
 -  - earth surface area \(ft^2\) \(m^2\) \(m^2\) \(5.100\;720\;x\;10^{14}\) \(m^2\)
 -  - earth volume \(ft^3\) \(m^3\) \(m^3\) \(1.083\;21\;x\;10^{21}\) \(m^3\)
\(A_c\) - earthwork cross-section area \(ft^2\) \(m^2\) \(m^2\) -
\(V\) - earthwork cross-section volume \(ft^3\) \(m^3\) \(m^3\) -
\(e\) - eccentricity \(in\) \(mm\) \(mm\)  -
\(Ec\) - Eckert number dimensionless  -
\(I\) - effective line current \(I\) \(I\) \(C - s^{-1}\)   -
\(V\) - effective line voltage \(V\) \(V\) \(kg-m^2-s^{-3}-A^{-1}\)   -
\(D_e\) - effective diffusivity \(\large{ \frac{ft^2}{sec} }\) \(\large{ \frac{m^2}{s} }\) \(m^2-s^{-1}\)  -
\(D_{eff}\) - effective diffusivity coefficient - - - -
\(m*_n\), \(\;m*_p\) - effective mass - - -  -
\(A\) - effective mass transfer area \(ft^2\) \(m^2\) \(m^2\)  -
\(\eta \) eta efficiency dimensionless  -
\(\Theta_e\) Theta Einstein temperature - - -  -
\(Ek\) - Ekman number dimensionless  -
\(E\) - elastic - -    -
\(\lambda\) lambda elastic modulus \(\large{\frac{lbf}{in^2}}\) \(MPa\) \(N-mm^{-2}\)   -
\(\lambda_c\), \(\;E_c\) lambda elastic modulus of concrete \(\large{\frac{lbf}{in^2}}\) \(MPa\) \(N-mm^{-2}\) -
\(\mu_0\) mu electric permittivity vacuum - \(\large{\frac{F}{m}}\) \(F-m^{-1}\) \(8.854\;187\;8128\;(13)\;x\;10^{-12}\) \(\large{\frac{F}{m}}\)
\(PE\), \(\;E_p\) - elastic potential energy \(lbf-ft\) \(J\) \(kg-m^2-s^{-2}\)  -
\(S\) - elastic section modulus \(\large{\frac{lbf}{in^2}}\) \(MPa\) \(N-mm^{-2}\)  -
\(E\) - elasticity - - -  -
\(El\) - elasticity number dimensionless  -
\(q\) - electric charge \(C\) \(A-s\) \(A-s\)  -
\(\rho\) rho electric charge density \(\large{\frac{A-sec}{ft^3}}\) \(\large{\frac{C}{m^3}}\) \(C-m^{-3}\) -
\(F\) - electric capacitance - - -  -
\(S\) - electric conductance - - -  -
\(\sigma\) sigma electric conductivity - \(\large{\frac{S}{m}}\) \(A^2-s^3-kg^{-1}-m^{-3}\) -
\(\rho_{ik}\) rho electric conductivity tensor - - -  -
\(\varepsilon_0\) varepsilon electric constant - \(\large{\frac{F}{m}}\) \(F-m^{-1}\) \(8.8542\;x\;10^{-12}\) \(\large{\frac{F}{m}}\)
\(I\) - electric current \(I\) \(\large{\frac{C}{s}}\) \(C - s^{-1}\)  -
\(J\) - electric current density - \(\large{\frac{A}{m^2}}\) \(A - m^{-2}\)  -
\(p\) - electric dipole moment - - -  -
\(D\) - electric displacement - - -  -
\(E\) - electric field - \(\large{\frac{V}{m}}\) \(V-m^{-1}\)  -
- - electric field density - - - -
\(E\) - electric field strength - \(\large{\frac{V}{m}}\) \(V-m^{-1}\) -
\(\psi\) psi electric flux - -    -
\(D\) - electric flux density   \(\large{\frac{C}{m^2}}\) \(C-m^{-2}\) -
\(V\), \(\;\phi\) phi electric potential - - -  -
\(U_e\) - electric potential energy - - -  -
\(P\) - electric power \(W\) \(\large{\frac{kg-m^2}{s^3}}\)  \(kg-m^2-s^{-3}\)  -
\(\Omega\) Omega electric resistance \(\Omega\) \(\large{\frac{kg-m^2}{s^3-A^2}}\)  \(kg-m^2-s^{-3}-A^{-2}\)  -
\(\rho \) rho electric resistivity - - - -
\(X_c\) - electric susceptibility - - -  -
\(V\) - elrctric voltage \(V\) \(\large{\frac{kg-m^2}{s^{3}-A}}\)  \(kg-m^2-s^{-3}-A^{-1}\) -
\(EM\) - electromagnetic energy - - - -
\(e\) - electron - - -  -
\(E_{ea}\) - electron affinity - - -  -
\(e\) - electron charge \(A-sec\) \(C\) \(A-s\) -
 \(Qm\) - electron mass-to-charge ratio \(A-sec\) \(C\) \(A-s\) \(1.602\;x\;10^{-19}\) \(C\)
\(D_e\) - electron diffusion coefficient - - -  -
\(a_{ge}\) - electron gravitational coupling constant dimensionless constant \(2.40\;x\;10^{-43}\)
\(E_e\) - electron rest energy \(\large{\frac{lbm-ft^2}{sec}}\) \(J\) \(kg-m^2-s^{-2}\) \(8.187\;105\;\;06\;(36)\;x\;10^{-14}\) \(J\)
\(g_e\) - electron g-factor dimensionless constant \(-2.002\;319\;304\;362\;56\;(35)\)
\(m_e\) - electron mass \(lbm\) \(kg\) \(kg\) \(9.109\;383\;7015(28)\;x\;10^{-31}\) \(kg\)
\(m_c\)  - electron molar charge \(\large{\frac{A-sec}{mol}}\) \(\large{\frac{C}{mol}}\)  \(C-mol^{-1}\) \(-9.648\;533\;65\;(21)\;x\;10^{4}\) \(\large{\frac{C}{mol}}\)
\(M \left( e \right)\), \(\;M_e\) - electron molar mass \(\large{\frac{lbm}{mol}}\) \(\large{\frac{kg}{mol}}\)  \(kg-mol^{-1}\)  \(5.485\;799\;0946\;(22)\;x\;10^{-7}\) \(\large{\frac{kg}{mol}}\)
\(n\), \(\;n_n\), \(\;n^{12}\) - electron number density - - -  -
\(g_\lambda\) lambda electron orbital g-factor dimensionless constant \(0.993\;643\;364\)
\(O_e\) - electron outer shell multiplier dimensionless constant \(2.138\;743\;820\)
\(K_e\) - electron partical wave center point dimensionless constant \(10\)
\(w_{pe}\) - electron plasma circular frequency - - -  -
\(\frac {m_c}{m_p}\) - electron-proton mass ratio dimensionless constant \(5.446\;170\;2178\;x\;10^{-4}\)
\(r_e\) - electron radius \(ft\) \(m\) \(m\) \(2.817\;940\;3262\;x\;10^{-15}\) \(m\)
\(m_e\) - electron rest mass \(lbm\) \(kg\) \(kg\) \(9.109\;382\;\;91\;(40)\;x\;10^{-31}\) \(kg\)
\(\frac {-e}{m_e}\) - electron specific charge - - -  -
\(g_a\) - electron spin g-factor dimensionless constant \(0.976\;448\;541\)
\(T_e\) - electron temperature - - -  -
\(e\) - electronic charge - - -  -
\(u \;or\; w\) - electromagnetic energy density - - -  -
\(E\), \(\;\varepsilon\) varepsilon electromotive force (EMF) - - -  -
\(F_e \) - electrostatic force \(lbf\) \(N\)  \(kg-m-s^{-2}\)  -
\(e\), \(\;q_e\) - elementary change - \(C\) \(A-s\) \(1.602\;176\;634\;x\;10^{-19}\) \(C\)
\(y\) - elevation \(ft\) or \(in\) $\(m\) or \(mm\) \(m\) or \(mm\)  -
\(y_i\) - elevation at inlet \(ft\) or \(in\) $\(m\) or \(mm\) \(m\) or \(mm\)  -
\(y_o\)  - elevation at outlet \(ft\) or \(in\) $\(m\) or \(mm\) \(m\) or \(mm\)  -
\(\Delta y\) Delta elevation differential \(ft\) or \(in\) $\(m\) or \(mm\) \(m\) or \(mm\)  -
\(E\) - elongation \(ft\) or \(in\) $\(m\) or \(mm\) \(m\) or \(mm\) -
\(E_p\) - elongation percentage dimensionless -
\(E\) - emission rate \(\large{\frac{lbf}{hr}}\) \(\large{\frac{kg}{h}}\) \(kg-h^{-1}\) -
\(\epsilon\) epsilon emissivity \(F\) \(C\) \(A-s\)  -
\(\epsilon\) epsilon emissivity of the material \(F\) \(C\) \(A-s\)  -
\(E\) - emissive power \(\large{\frac{Btu}{ft^2-hr}}\) \(\large{\frac{W}{m^2}}\) \(W-m^{-2}\)   -
\(\gamma\) gamma empirical constant \(\large{\frac{1}{hr}}\) \(\large{\frac{1}{s}}\) \(m\) or \(mm\)  -
\(\epsilon\) epsilon empirical loss coefficient dimensionless  -
\(r\) - empirical rate \(\large{\frac{1}{hr}}\) \(\large{\frac{1}{s}}\) \(1-s^{-1}\)  -
\(r\) - empirical rate constant \(\large{\frac{1}{hr}}\) \(\large{\frac{1}{s}}\) \(1-s^{-1}\) -
 \(E\), \(\;W\) - energy \(lbf-ft\) \(J\) \(kg-m^2-s^{-2}\)  -
\(\Delta E\) - energy differential \(lbf-ft\) \(J\) \(kg-m^2-s^{-2}\)  -
\(EER\) - energy efficiency rating or ratio dimensionless  -
\(\epsilon\) epsilon energy of particle \(lbf-ft\) \(J\) \(kg-m^2-s^{-2}\)  -
\(E_g\) - energy gap \(lbf-ft\) \(J\) \(kg-m^2-s^{-2}\)  -
\(E\) - energy usage (usage) \(kW-hr\) \(kW-h\) \(kW-h\)   -
\(EHP\), \(\;HP_e\) - engine horsepower \(\large{\frac{lbf-ft}{sec}}\) \(\large{\frac{Btu}{s}}\) \(Btu-s^{-1}\) -
\(RPM\) - engine speed \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{s}}\) \(m-s^{-1}\)  -
\(H\) - enthalpy \(\large{\frac{Btu}{lbm}}\) \(\large{\frac{kJ}{kg}}\) \(kJ-kg^{-1}\)  -
\(\large{ \partial H }\) partial enthalpy rate of change - - - -
\(S\) - entropy \(\large{\frac{Btu}{lbm-R}}\) \(\large{\frac{kJ}{kg-K}}\) \(kJ-kg^{-1}-K^{-1}\)  -
\(\Delta S\) Delta entropy differential \(\large{\frac{Btu}{lbm-R}}\) \(\large{\frac{kJ}{kg-K}}\) \(kJ-kg^{-1}-K^{-1}\)  -
\(\phi\) phi entropy function - - -  -
\(Eo\) - Eotvos number dimensionless  -
\(x\) - equilibrium \(in\) \(mm\) \(mm\) -
\(K\) - equilibrium constant - - -  -
\(EW\) - equivalent weight  \(\large{\frac{lbm}{lbmol}}\)

 \(\large{\frac{kg}{kmol}}\)

\(kg-kmol^{-1}\)  -
\(Er\) - Ericksen number dimensionless -
\(v_e\) - escape velocity \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{s}}\) \(m-s^{-1}\)  -
\(A\) - estimated annual soil loss \(tons-acre-yr\) \(tonnes-hectare-yr\) \(tonnes-hectare-yr\) -
\(A_e\), \(\;P_e\) - Ettinghausen coefficient - - -  -
\(Eu\) - Euler number dimensionless constant  \(2.718\;281\;828\;459...\)
\(\Delta h_f\) Delta evaporation enthalpy change - - -  -
\(\Theta_r\) Theta excess temperature coefficient dimensionless  -
\(Q\) - exchanged heat in a heat exchanger \(\large{ \frac{Btu}{lbm}}\) \(\large{ \frac{kJ}{kg}}\) \(kJ-kg^{-1}\) -
\(Y\) - expansion coefficient \(\large{ \frac{in}{in-F} }\) \(\large{ \frac{mm}{mm-C} }\) \(mm-mm^{-1}-C^{-1}\)  -
\(Y\) - expansion factor dimensionless  -
\(\tau\) tau exponential time constant \(sec\) \(s\) \(s\)  -
\(p_e\) - external pressure \(\large{\frac{lbf}{in^2}}\) \(MPa\) \(N-mm^{-2}\) -
\(r_e\) - external radius \(in\) \(mm\) \(mm\) -
Symbol Greek Symbol Definition English Metric   Value

 

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