Formula Symbols - E
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E
| Symbol | Greek Symbol | Definition | English | Metric | SI | Value |
|---|---|---|---|---|---|---|
| - | - | 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 | \(V\) | \(V\) | \(kg-m^2-s^{-3}-A^{-1}\) | - |
| \(m*_n\), \(\;m*_p\) | - | 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 | - | - | - | - |
| \(e\), \(\;q_e\) | - | 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 | \(in\) | \(mm\) | \(mm\) | - |
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